Project Skylab was designed to demonstrate that a person can work and live in space for prolonged periods without ill effects.

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问题 Project Skylab was designed to demonstrate that a person can work and live in space for prolonged periods without ill effects.

选项 A、unexpected
B、obvious
C、adverse
D、immediate

答案C

解析坏的，有害的

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职称英语卫生类B级

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