单项选择题
If I didn't ______ them ______ I should probably forget all about them.
A．wrote; down
B．write; down
C．write; for
D．written; about
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单项选择题
It is stated in the passage that those responsible for giving a product customer- appeal are ______.
A．customers
B．designers
C．advertisers
D．manufacturers
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单项选择题
According to the passage, it is difficult to be certain about the distant future of the universe because we ______.
A．have too many conflicting theories
B．do not have enough funding to continue our research
C．are not sure how the universe is put together
D．have focused our investigations on the moon and planets
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