题目内容
（请给出正确答案）
[单选题]
The scientists are（）a series of experiments to learn more about how the body adapts to weightlessness.
A.defining
B.doing
C.having
D.carrying
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.defining
B.doing
C.having
D.carrying
如果结果不匹配，请 联系老师 获取答案
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A．Y
B．N
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A.Atmospheric scientists
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C.The previous calculations of the effect of aerosols
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