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.
【C10】
选项 A、what
B、that
C、which
D、how
答案A
解析 本题考查的是宾语从句。lead to后面一般加上名词性成分，表示导致的结果。这里的to是介词，所以后面的关系词不可以用that。which一般指代单数，而后文的例子不止两个。how一般指方式，这里也不合适。综上所述，what最适合。故选A。
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