单项选择题

______ there is a logical connection between all the things that happen in that immensely connected body of salted water that covers 71 percent of the surface of the earth.

A．I dawn upon it that
B．It dawns upon me that
C．I dawn upon this that
D．This dawns upon me that

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单项选择题

The most versatile ______ embryonic stem cells, which ______ found in the embryo at the earliest stage of development and can grow into any part of the body.

A．are, are
B．is, is
C．are, is
D．is, are

单项选择题

And while we ______ have a great deal of trouble adjusting to a climate that gets 2 degrees centigrade warmer over the next century, an ice age by mid-century--be unimaginably devastating.

A．might, could
B．could, might
C．would, might
D．might, would

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