单选题：In space, ___and equipment need many forms of protection.（　　

题目分类：英语运用能力测试
题目类型：单选题
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题目内容：

In space, ___and equipment need many forms of protection.（　　） A．pilots
B．astronauts
C．engineers
D．scientists

参考答案：

答案解析：

回答第59空。

回答第59空。A．A　persist B．B　continue C．C　grant D．D　fight

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