线粒体的生长发育是由两套遗传系统控制的，两套系统可以相互补偿，以便协调控制。
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A．Westerners are unwilling to shake hands.B．Westerners are more reserved than the Chin
A. Westerners are unwilling to shake hands.
B. Westerners are more reserved than the Chinese.
C. We shouldn't shake hands with European women.
D. We should make a judgment before shaking hands.
The phrase "hits the jackpot" (Line 6, Para. 4) probably means"______".
A. get out of business suddenly
B. be discovered accidentally by foresighted businessman
C. make a lot of money unexpectedly
D. prove to be very useful in daily life by chance
常染色质是用碱性染料染色时着色浅的那些染色质。
A. 正确
B. 错误
Words of praise keep changing because ______.
A. they lose their freshness
B. there are more words available in this area
C. young people are becoming more discriminating
D. older people try to avoid the in-words of the young
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