题目内容

科学是没有国界,但科学家有自己的祖国。()

A. 对
B. 错

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4. These are my pens. Where are ()?

A. their
B. theirs
C. my
D. your

如果中子和质子一样重,或电子再重上5倍,那宇宙现状不会发生变化。()

A. 对
B. 错

5. This bag of () used to be one of the best sellers in the shop.

A. his
B. him
C. it
D. itself

1.连线题。

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