单项选择题

Questions 19 to 22 are based on the conversation yon have just heard.

A．Usually warm but sometimes very cold and wet.
B．Always warm.
C．Usually cold and wet but sometimes warm.
D．Always cold.
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填空题
The construction of massive dams and irrigation projects does more harm than good.
单项选择题
A．It was getting dark.B．He was afraid of being blamed by his friend.C．The birds might have flown away.D．His friend would arrive any time.
A．It was getting dark.
B．He was afraid of being blamed by his friend.
C．The birds might have flown away.
D．His friend would arrive any time.
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