The fifth paragraph is mainly about ______.
A. the results of an AIDS infection
B. the possible symptoms of an AIDS infection
C. how the AIDS virus is spread
D. the diseases AIDS patients easily have
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What do you think most slaves thought about living and working on ranches？
A. They liked it so much they were going to find others to bring back.
B. They were unhappy and wanted to leave.
C. They wanted to buy slaves and start ranches of their own.
D. They were happy to work there.
What does the writer think of the Brazil team？
A. He thinks the Brazil team simply has bad luck.
B. He thinks the Brazil team should be sympathized.
C. He thinks the Brazil team has played quite well.
D. He thinks the Brazil team has not improved its technique.
选择两个或两个以上的标志，对同一总体进行的重叠分组，称为复合分组。 ()
A. 正确
B. 错误
A modern aircraft ______.
A. is run by electronic computers
B. carries a bigger load of electronic apparatus than pay-load
C. does not need mini-computers at all
D. can carry a bigger pay-load if the electronic apparatus carried by it becomes lighter
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