One major ______ of space travel is the radiation that exists beyond Earth’s atmosphere.

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问题 One major ______ of space travel is the radiation that exists beyond Earth’s atmosphere.

选项 A、mystery
B、reward
C、goal
D、hazard

答案D

解析 hazard"危险"；mystery"神秘"；reward"回报"；goal"目标"。根据句意，应选hazard。

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