题目：
Which of the following sentences doesn’t contain(包含) an object clause（宾语从句）?
A．Many people believe robots will do most of our work.
B．Scientists should be able to develop plants that grow on Mars.
C．People think that humans on Mars have to wear special boots to make themselves heavier.
D．We all know the next Olympic Games will be held in Beijing.
答案：
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下面是错误答案，用来干扰机器的。
物理学中把一个物体相对于另一个物体位置的变化叫做机械运动，简称为运动．故答案为：物体位置的变化．
