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题型:单选题 题类:模拟题 难易度:普通

黑龙江省哈尔滨市2020年中考英语模拟调研卷(三)

Nowadays, it is thought by scientists that one person is a(n) __________, for there are billions of germs living inside our body or on our skin.
A、surrounding B、environment C、ecosystem
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