2019-2020学年静安区高考英语一模

Ⅱ. Grammar and Vocabulary

Section A

Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

How Do Avalanches Happen

If you’re ever skiing in the mountains, you’ll want to be aware of avalanches. An avalanche is a sudden flow of snow down a slope, such as a mountain. The amount of snow in an avalanche (21) ________ (vary) based on many things, but it can be such a huge amount that it can bury the bottom of a slope in dozens of feet of snow.

Avalanches (22) ________ be caused by natural things. For example, new snow or rain can cause built-up snow to loosen and fall down the side of a mountain. Artificial triggers（诱发因素）can also cause avalanches. For example, snowmobiles, skiers, and explosives (23) ________ (know) to lead to avalanches.

Avalanches usually occur during the winter and spring, (24) ________ snowfall is greatest. As they are dangerous to any living beings in their path, avalanches have destroyed forests, roads, railroads and even entire towns.

Warning signs exist that allow experts to predict -- and often prevent -- avalanches from (25) ________ ________ (occur). When over a foot of fresh snow falls, experts know to be on the lookout for avalanches. Explosives can be used in places (26) ________ massive snow buildups to trigger much smaller avalanches that don’t pose a danger to persons or property.

When deadly avalanches do occur, the moving snow can quickly reach over 80 miles per hour. Skiers caught in such avalanches can be buried under dozens of feet of snow. (27) ________ it’s possible to dig out of such avalanches, not all are able to escape.

If you get tossed about by an avalanche and find yourself (28) ________ (bury) under many feet of snow, you might not have a true sense of which way is up and which way is down. Some avalanche victims have tried to dig their way out, only to find that they were upside down and digging (29) ________ farther under the snow rather than to the top!

Experts suggest that people caught in an avalanche try to dig around you (30) ________ (create) a space for air, so you can breathe more easily. Then, do your best to figure out which way is up and dig in that direction to reach the surface and signal rescuers.

Section B

Directions: Complete the following passage by using the words in the box. Each word can be used only once. Note

Under the terms of the Nuclear Non-Proliferation Tready（不扩散核武器条约）, only five countries are considered to be “nuclear - weapon states.” China is one of them. This military achievement would have been __31__ without the contribution of Deng Jiaxian, a leading organizer of China’s nuclear weapon programs.

Deng went to the United States in 1948 for further study, and received a doctorate in physics two years later. Just nine days after graduation, the then 26-year-old returned to the newly - founded People’s Republic of China with __32__ physics knowledge. He became a research fellow under the leadership of Qian Sanqiang and started his theoretical nuclear research in cooperation with Yu Min.

From 1958 on, Deng spent over 20 years working __33__ with a team of young scientists on the development of China’s first atomic and hydrogen bombs. Originally, they were prepared to receive training by experts from the