填空题

Among the theories to explain the origin of AIDS, the polio vaccine theory, in the opinion of the author of the article, seems to be the most plausible one.

【参考答案】

Y

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填空题

Some rural African were infected with AIDS because they were given injections of Koprowski’s vaccine.

单项选择题

A．Professor Simms kept the class late.B．He couldn’t find Professor Simms’s classroom.C．Professor Simms, lecture is about the sea.D．He didn’t understand Professor Simms’ lecture.

A．Professor Simms kept the class late.
B．He couldn’t find Professor Simms’s classroom.
C．Professor Simms, lecture is about the sea.
D．He didn’t understand Professor Simms’ lecture.

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