A: Good morning.______ B: I have been coughing for a flew days.
A.How are you?
B.Nice to meet you.
C.What's the trouble?
D.What are you doing now?
第5题
就一条河流而言,通常又分为()、上游、中游、下游和河口五个部分。
A.山区
B.丘陵
C.平原
D.河源
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