单项选择题

In the past decade some third world countries have suffered from a cycle of drought ______ with flood.

A．altering
B．activating
C．nominations
D．alternating
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单项选择题
I asked the tailor to make a small ______ to my trousers because they were too long.
A．change
B．variation
C．revision
D．alteration
单项选择题
The doctor did not rule out the possibility of food poisoning.
A．foresee
B．accept
C．exclude
D．foretell
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