—The scientists are ____ a series of experiments to learn more about how the ...

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问题 —The scientists are ____ a series of experiments to learn more about how the body adapts to weightlessness.

选项 A. defining
B. having
C. carrying
D. making

答案D

解析科学家正在做一系列的实验，去研究更多关于在失重的情况人的身体如何去适应的问题。

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