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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D. sensitive
D. sensitive
单项选择题
John and I have ______ to meet at the bus station at 9 o'clock.
A．confirmed
B．combined
C．appointed
D．arranged
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