单项选择题

Not until the early years of the 19th century ______ know what heat is.

A. did man

B. man did
C. have man

D. man have
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单项选择题
A. I will go swimming. B. I think it begins at 3 o’clock. C. Sorry, I’ve no idea. D. I don’t know who it is.
A. I will go swimming. B. I think it begins at 3 o’clock.
C. Sorry, I’ve no idea. D. I don’t know who it is.
填空题
White mice will be used to test the safety of (11) prepared for athletes competing in the 2008 Olympic Games, (12) in Beijing said. Milk, alcohol, salad, rice, oil, salt and seasonings will be tested by white mice (13) hours before being used as ingredients in food prepared for athletes, said Zhao Xinsheng. He said mice would (14) adverse reactions to poisoning with 17 hours, which is quicker (15) test results derived from methods like bacterial cultures.
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