单项选择题

You can’t help but hear commercials; every few minutes the program is interrupted to give you one advertising ______

A. so on and so forth
B. more or less
C. something or other
D. sooner or later

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单项选择题
According to the author, when should be regarded as the beginning of human history
A. The appearance of vertebrates.
B. The point when human beings consciously chose to do something.
C. The coming into being of the photosynthetic cells.
D. The origins of the universe.
单项选择题
When a snake meets a potential enemy, its primary device is
A. avoiding any observation.
B. finding a safe shelter.
C. giving a warning threat.

D. starting a quick attack.
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