—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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