单项选择题

What does the author see as the function of the universe’ s unseen "switches"()

A. They tell us which one of the tracks the universe will use.
B. They enable us to alter the course of universe.
C. They give us information about the lunar surface.
D. They determine which course the universe will take in the future.

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单项选择题

The Lost Sea is unique because it is ()

A. part of a historical cave system
B. the biggest underground lake in the world
C. listed in the Guinness Book of World Records
D. the largest body of water in Tennessee

单项选择题

At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly()to another subject.

A. committed
B. switched
C. favoured
D. transferred