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【单选题】

石灰岩主要是由石英砂或石灰岩等细小碎屑经沉积并重新胶结而成的岩石。

A.
错误
B.
正确
举报
参考答案:
参考解析:
.
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【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...

A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.