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 i

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

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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 the 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 sledges to help carry them, but it’ s a challenging invention【C6】________if you hit a rock with the sledges as you pull it, the contents can【C7】________In other cultures, people invented the wheels, 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 wheels 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 10 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.
【C6】
选项 A、unless
B、but
C、even
D、since
答案D
解析 本题考查词义辨析。空格所在句意思是：你可以把货物绑在雪橇上来运载，但同时雪橇也是一项有挑战性的发明，因为一旦撞上石头，雪橇上面的货物就会滑落。unless意为“除非”，but意为“但是”，even意为“甚至”，since意为“因为”。结合上下文语境可知，D选项更符合题意，故选D。
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