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1、Unit 3Science and nature课时分层作业(七)Section 、(建议用时：35分钟)语言知识练习固基础单句语法填空1She is the first one _(understand) that problem.2_ the other hand，we students have to do masses of homework both at home and at school.3Many Chinese college graduates leave their country to get further education in America _ the in
2、tention of getting better jobs in the future.4A lot of students waste their spare time surfing the Net；_ a consequence，they often fail to finish their homework on time.5Turn off the TV，so you can concentrate _ your homework.6Nowadays，some hot network languages _(adopt)in some official media，such as
3、CCTV and Peoples Daily.7If he _(improve) his IT skills，hed easily get a job.8The children were anxious for their mother _(come) as soon as possible.9_(exact) speaking，you are to blame for the accident.10No matter what happens，we must push ahead _ our plan.高考题型练习提能力.阅读理解Plant cloning has been an agri
4、cultural technique used by farmers and gardeners for centuries.Grafting(嫁接) is a common form of plant cloning.Many plants in nature actually clone themselves and reproduce asexually.Cloned plants are much more predictable than normal plants，so their yield(产量)is more reliable.Cloned plants also repro
5、duce faster，limiting the amount of time between planting and harvesting.It is also often cheaper to produce seeds through cloning than through traditional methods.Plants can essentially be optimized so that farmers or individual growers always have the best seeds available.With more yield at a faste
6、r rate，farms can produce more food for more people while decreasing overall costs.Cloning can be used to wipe out diseases that previously killed off entire fields of crops.This would make plants immune(免疫的)to the kinds of diseases that farmers and gardeners around the world fear each year.Crop fail
7、ures due to disease and virus could become a thing of the past.Also，plants that are near extinction can be brought back to life through cloning.Through cloning scientists can develop“super”fruits and vegetables of superior nutritional quality.This could make for a healthier population overall.This i
8、s already being done through selective pollination(授粉)，and genetic cloning could take it to the next level.By plant cloning we have a population of identical plants and all these plants equally suffer from the same diseases，but in nature the weak would die and the strong would survive.While there ar
9、e some dangers to consider with plant cloning，there are plenty of benefits that could prove vital to the propagation(繁衍)of the human species.1The underlined word“optimized”in Paragraph 2 can be replaced by“_”AenlargedBproducedCperfectedDexamined2According to the text，cloned plants_Ahave lower yield
10、than normal plantsBhave a short growth cycleCresist various kinds of diseasesDneed little care from people3What can we infer from the text?AThe fruits produced by cloned plants taste much better.BThere are more cloned plants than normal plants.CPlant cloning can disturb the laws of nature.DPeople sh
11、ould avoid eating cloned fruits.4What is the main purpose of the text?ATo warn the negative effects of plant cloning.BTo present different kinds of plant cloning.CTo predict the future of plant cloning.DTo inform us about the advantages of plant cloning.阅读七选五(2019山东省邹城市第一中学高二上学期期中)Are These the Best
12、 Years of Your Life?The ups and downs of life may seem to have no predictable plan.But scientists now know there are very clear life patterns that almost all people share.Even if you have passed some of your best years, you still have other good years to come. _1_When are you smartest? From 18 to 25
13、, according to IQ.scores; but you are wiser and more experienced with increasing age.Youre sharpest in your 20s; around 30, mental abilities begin to decline, particularly your ability to do maths._2_ Your vocabulary at age 45, for example, is three times as great as when you graduated from college.
14、At 60, your brain possesses almost four times as much information as it did at age 21._3_ You have the best physical sense of yourself from 15 to 24, when you feel energetic all the time.The best professional sense seems from 40 to 49.Before age 24, we believe that our happiest years are yet to come
15、.Over 30, we believe that theyre behind us.A National Health Survey agrees: After age 30, we “become more realistic and do not view happiness as a goal in itself.If we keep our health, achieve professional and emotional goals, then happiness, we feel, will follow.”_4_ Generally between 30 to 39, but
16、 the peak(顶峰) varies with different professions.Mozart wrote a symphony by age eight, and Mendelssohn composed his bestknown work，A Midsummer Nights Dream, at 17, but most of the great music was written by men between 33 and 39.Though the peak in most fields comes earlymost Nobel Prize winners did t
17、heir top research in their late 20s and 30s, creative people continue to produce quality work throughout their lives._5_AWhen are you happiest?BWhen are you most creative?CBut your ability to complete other tasks climbs.DThe above gives you an accurate figure.ECertain good years seem to come later i
18、n life.FFor people who are creative, there is no upper age limit.GThe human life journey cannot be charted by a clear life pattern.语法填空(2019内蒙古鄂尔多斯市第一中学高二上学期第三次月考)Yiwu, China, April 29 (Reuters)The first freight train (货运列车) to run from Britain to China arrived in the city of Yiwu in eastern China o
19、n Saturday，1._(complete) its 12，000 kmsjourney.The train，2._carried items such as vitamins and baby products，3._(greet) by traders and shipping company officials when it arrived at Yiwu West station after departing London on April 10.The first freight train from China arrived in Britain in January.4
20、_(operate) by Yiwu Timex Industrial Investment, the YiwuLondon freight service makes London 5._15th European city to have a rail link 6._(direct) with China after the 2013 beginning of the “One Belt, One Road” initiative (倡议) by Chinese President Xi Jinping.“This freight train is a 7._(reflect) of t
21、he achievements of trade，” Yiwu Timex Chairman Timmy Feng told Reuters Television.After leaving London the bright red train passed through seven 8._(country)France, Belgium, Germany, Poland, Belarus, Russia and Kazakhstanbefore arriving in Yiwu.For Britain，the train 9._(be) part of an effort to strengthen trade links with the rest of the world as it prepares to leave the European Union 10._two years time.