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1、短文填空江苏省南京市玄武区2020-2021学年八年级上学期期末考试英语试卷 七、首字母填空。（每空1分，满分10分）A weak polar bear is standing on a small piece of ice, drifting （漂流）in the sea. He is 1 81 the thick ice that used to be his home and hunting ground.The Arctic Ocean makes up two-thirds of the Arctic I is almost c _82_ with sea ice during th
2、e winter. During the s _ 83 , around 50 percent of the sea is also frozen. It*s home to more than 21, OOOspecies （物种）and about 4 million people.There has been a lot of bad news in recent years about how climate （气候）change has affected the Arctic （匕极）.This October, a group of scientists returned from
3、 a year-long Arctic expedition （远征）.They had m_84_ bad news : all Arctic ice may disappear during the summer in just some years. The temperature n the Arctic is 18 degrees h _85_ than it was 125years ago. Even at the North Pole, the coldest point in the Arctic, scientists found badly melted （融化的）, t
4、hin ice.Polar bears are not the only animals that are suffering. Animals like seals also depend on the ice to rest, give birth and r 86 _ babies. The loss of ice means the loss of their habitat （栖息、地）. Since theres now more rain, moss （苔解）and grass are locked in ice instead of snow. Many reindeer （驯
5、鹿）fail to get their f 87 under the hard ice. According to the World Wildlife Fund（WWF）, the number of deer has d 88 by 56 percent in the last 20years.Melting sea ice is also o 89 the door for more human activities, such as shipping, traveling and fishing. This will disturb （扰舌L） the areas environmen
6、t and the Arctic would never be the same again. Meanwhile, as the ice melts, sea levels will r 90 Coastal cities may go underwater, and therell be more extreme weather.You might think the 4G mobile connection on your phone is quite fast. H 81 an even faster and stronger technology is just around the
7、 corner.5G networks will I 82 us to a new world.What is 5G? It*s the newest generation of cellular network technology. It works by u 83 a wider range of the radio spectrum （射频频谱）,allowing a greater number of signals （信号） to be sent and receive at higher speeds.People will be a 84 to use the Internet
8、 at a much greater speed than before. 56 will increase download speeds to up to 20 Gb per second-much faster than 4Gs 1 Gb per second. That m 85 a movie can be downloaded in just a few seconds!Most importantly, 5G*s greater network capacity （容量）shows that we can connect not j 86 people to people, bu
9、t also people to machines, or to just about anything. For example, the lights in your living room, the fridge in your kitchen-all of them can be controlled w 87 your phone. Outside of the home, factory owners can use it to control their robots. F-88- could use it to follow nsmart tractors on their f
10、arms. Wearable devices （设备）could send updates to your doctor about changes of your h 89 , Driverless cars and home delivery drones （送货无人机） will depend on 5G to work b 90 . A completely wireless （无线的）world is at our doorstep.81. 82. 83. 84. 85. 86. 87. 88. 89. 90. Most of us use alarm clocks to wake
11、up on time for school or work. We look at our watches to know when to get on the bus or t 81 However, there is also a proper time to eat, sleep, exercise, and take medicine, too. We cant look at a clock fbr the right t 82 for these activities. We must listen to the clock i 83 our bodies: the biologi
12、cal clock.Barbara Wells exercised every morning. She woke up at 6 a.m. She ran about two miles before w 84 . Then she went to her office. But Barbaras legs and back started to hurt. She did some exercises before she ran. But her legs and back still hurt. She ran slower, but the pain didnt stop. Barb
13、ara talked to her doctor. The doctor said to her, Dont run in the morning. Try to exercise 185 in the day. That is the time when your body is at the right temperature forexercise after work. Her legs and back dont hurt anymore.Today, doctors around the world are learning much more about chronobiolog
14、y （时间生物 学），the s 86 of biology clocks. They are learning about the i 87 of time for our bodies. For example, it is best for people to go to sleep at the same time every night and to eat only when they are very hungry. A 88, doctors discovered that some illnesses,such as heart attacks （心、脏/肉）occur （发生）most often in the morning. This information tells them that the b 89 time to take heart medication may be at night. When patients take heart medicine at night, they may p 90 a heart attack in the morning.