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1、大学英语四级阅读 40 篇之十（含答案）if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will have used up all the oil that drives our cars,for example.ev
2、en if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting life at present.one possible solution to the problem,however,ha
3、s recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as earth itself.the difficult is that venus is much hotter tha
4、n the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as soon as this has been done,the algae will be placed in small
5、rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become cooler,but befor man can set foot on venus it will be neccessary
6、for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble problem caused by population growth on earth will probably be
7、the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water on venusd.the days on venus are long enough3.on venus there i
8、s a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae have done their workb.the atmosphere becomes coolerc.thereis
9、oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will have used up all the oil that drives our cars,fo
10、r example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting life at present.one possible solution to the proble
11、m,however,has recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as earth itself.the difficult is that venus is muc
12、h hotter than the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as soon as this has been done,the algae will be plac
13、ed in small rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become cooler,but befor man can set foot on venus it will be
14、 neccessary for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble problem caused by population growth on earth will
15、probably be the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water on venusd.the days on venus are long enough3.on v
16、enus there is a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae have done their workb.the atmosphere becomes cool
17、erc.thereis oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will have used up all the oil that drives
18、 our cars,for example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting life at present.one possible solution t
19、o the problem,however,has recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as earth itself.the difficult is that
20、venus is much hotter than the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as soon as this has been done,the algae
21、will be placed in small rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become cooler,but befor man can set foot on venu
22、s it will be neccessary for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble problem caused by population growth on
23、 earth will probably be the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water on venusd.the days on venus are long
24、enough3.on venus there is a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae have done their workb.the atmosphere
25、becomes coolerc.thereis oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will have used up all the oil
26、 that drives our cars,for example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting life at present.one possibl
27、e solution to the problem,however,has recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as earth itself.the diffic
28、ult is that venus is much hotter than the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as soon as this has been don
29、e,the algae will be placed in small rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become cooler,but befor man can set
30、foot on venus it will be neccessary for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble problem caused by populati
31、on growth on earth will probably be the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water on venusd.the days on ven
32、us are long enough3.on venus there is a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae have done their workb.the
33、 atmosphere becomes coolerc.thereis oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will have used up
34、 all the oil that drives our cars,for example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting life at present
35、.one possible solution to the problem,however,has recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as earth itsel
36、f.the difficult is that venus is much hotter than the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as soon as this
37、has been done,the algae will be placed in small rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become cooler,but befor
38、man can set foot on venus it will be neccessary for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble problem caused
39、 by population growth on earth will probably be the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water on venusd.the
40、 days on venus are long enough3.on venus there is a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae have done the
41、ir workb.the atmosphere becomes coolerc.thereis oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends continue,we will
42、have used up all the oil that drives our cars,for example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of supporting lif
43、e at present.one possible solution to the problem,however,has recently been suggested by american scientist,professor carl sagan.sagan believes that before the earths resources are compleetely exhausted it will be possible to change the atmophere of venus and so create a new world almost as large as
44、 earth itself.the difficult is that venus is much hotter than the earth and there is only a tiny amount of water there.sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on venus.as s
45、oon as this has been done,the algae will be placed in small rockets.spaceship will then fly to venus and fire the rockets into the atmosphere.in a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.when the algae have done theri work,the atmosphere will become coole
46、r,but befor man can set foot on venus it will be neccessary for the oxygen to produce rain.the surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on venus.1.inte long run,the most insoluble pr
47、oblem caused by population growth on earth will probably be the lack of _.a.food b.oilc.spaced.resources2.carl sagan believes that venus might be colonized from earth because _a.it might be possible to change its atmosphereb.its atmosphere is the same as the earthsc.there is a good supply of water o
48、n venusd.the days on venus are long enough3.on venus there is a lot of _.a.water b.carbon dioxidec.carbon monoxided.oxygen4.algae are plants that can_.a.live in very hot temperaturesb.live in very cold temperaturesc.manufacture oxygend.all of the above5.man can land on venus only when_.a.the algae h
49、ave done their workb.the atmosphere becomes coolerc.thereis oxygend.it rains there 答案：cabdd if the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.by the middle of the 21st century,if present trends conti
50、nue,we will have used up all the oil that drives our cars,for example.even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.but none of the other planets in our solar system are capable of su