2. 考研
  3. The history of transportation is very long and full of changes and inventions. It starts 【C1】______walking, which is not any inv

The history of transportation is very long and full of changes and inventions. It starts 【C1】______walking, which is not any inv

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问题     The history of transportation is very long and full of changes and inventions. It starts 【C1】______walking, which is not any invention; it just takes energy. People used to walk to get to other places. If you wanted to get somewhere quickly, the【C2】______ way to do that was to run. Actually, the first invention for transportation【C3】______ was the shoe. Centuries ago there were no shoes, and people walked barefoot.
    Then people invented【C4】______ to transport themselves and materials from one place to another. In some cultures, people invented sledges (雪橇),【C5】______ are a kind of board that you drag along the ground. You can tie things on the sledge to help carry them, but it’s a challenging invention【C6】______ if you hit a rock with the sledge as you pull it, the contents can 【C7】______  In other cultures, people invented the wheel, which they used to make it easier to move things—and people. That was the beginning of many innovations in transportation.
    【C8】______  people had wheels they could invent other ways to travel. They could put the wheel on a board and make it a wagon, and then they could【C9】______ that wagon to an ox or a horse and ride as well as carry materials. That wheel led to【C10】______ we have today: trucks, automobiles, and even boats and planes. For example, there were steamboats that used giant wheels that turned with blades, pushing the water and pushing the boat forward.
【C7】
选项 A、pull out
B、slip off
C、hold down
D、put down
答案B
解析 本题考查的是词组辨析。pull out“拔，撤离”；slip off“滑下来，滑落”；hold down“抑制，压制”；put down“记下”。原句中说拉雪橇过程中，物品可能会发生的情况，那只有滑落的情况。故选B。
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