题目
A.Just fine, thanks. What’s new?
B.Not bad, thank you. What’s wrong?
C.How are you? Long time no see!
第9题
A.HF > HI > HBr > HCl
B.HI > HBr > HCl >HF
C.HF > HCl > HBr >HI
D.HI > HBr > HF >HCl
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