单项选择题

People's dreams are () accompanied with eye-movements.

A.not
B.maybe
C.seldom
D.mostly

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单项选择题
Not having been discovered, many laws of nature actually exist in nature。()

A.虽然许多自然界的规律尚未被发现,但他们确实存在于自然界中。
B.存在于大自然中的很多法律还没有被科学界发明出来。
C.许多自然界的规律实际上存在于自然界中,尽管不能被发现。
D.尽管很多自然界的规律没有被找出,但这些规律实际上存在于自然界中。

单项选择题
A small population may mean ().

A.higher productivity, but a lower average income
B.lower productivity, but a higher average income
C.lower productivity, but a lower average income
D.higher productivity, and a higher average income

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