单项选择题
乙醛经氯化得三氯乙醛,它与水加成得到水合三氯乙醛,简称水合氯醛,是一种比较安全的催眠药和镇静药。
A、正确
B、错误
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单项选择题
Finding what is omitted but worth of mentioning is a way to find the opinion of the reporter.
A.正确
B.错误
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单项选择题
Backgrounds in news appear in different forms, they can be phrases, clauses, sentences, or even paragraphs.
A.正确
B.错误
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