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【参考答案】
是上一代将种系特征传递给下一代的活动。
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单项选择题
Only twenty percent of the work () done yesterday.
A. has
B. was
C. have
D. were
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单项选择题
—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job — () my students have a try
A. Shall
B. Must
C. Will
D. May
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