单项选择题

Passage One

A. They are too busy to detect it.
B. It is beyond their supervision.
C. The youth are threatened not to tell the truth.
D. It doesn’t show on the radar screen.
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单项选择题
A. The water will flow south.B. The sea level will rise.C. The ocean will become more acid.D. The floods will destroy cities:

A. The water will flow south.
B. The sea level will rise.
C. The ocean will become more acid.
D. The floods will destroy cities:
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