英语六级

单选题

A． They took short and quick steps.
B． They were pulled off the tread wheel.
C． They lost their balance.
D． They took longer and coordinated steps.

参考答案：D进入在线模考
 What happened to the divers at Martian gravity when the speed of the tread wheel was increased?
【解题思路】四个选项都以they开头，且从选项看they很可能指前面提到的divers，每个选项分别描述的是一种实验结果。
【解析】当纽曼逐渐提高踏车的速度时，潜水员步伐更大，姿势更优美，直至他们轻易地适应更快的行走速率，因此答案为D。

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