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参考答案:错
"Not having returned home yet, _____", his father said to the police. [ ]
A. his mother got worried
B. his mother must be worried
C. I think he is missing
D. he must have got into some trouble.
描述事物的数据有绝对数据和相对数据之分。大气中氧气的含量属于相对数据,常会用______的形式表示。
A.密度 B.百分数 C.比重 D.指数