(单选题)

What in space worries people?

A.Growing human activities.

B.Return of dead satellites.

C.Commercialization of space missions.

D.Space debris from missions.

参考答案：D

参考解析：

推理判断题。根据第六段第一句“With so much more human activity in space, orbital debris (残骸) is becoming more of a concern.”可知，人们担心的是太空垃圾，orbital debris意为“太空垃圾”。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语

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