Black holes are part of space. Black holes exist but are difficult to observe.

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问题 Black holes are part of space.
Black holes exist but are difficult to observe.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析

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本试题收录于：职称英语理工类C级题库职称英语分类

职称英语理工类C级

职称英语

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Black holes are part of space. Black holes exist but are difficult to observe.

职称英语理工类C级

职称英语

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