填空题

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

【参考答案】

N

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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.

填空题

______ was not discovered until 1961, and the U.S. Food and Drug Administration has since acted to ensure against similar contaminations.

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