题目内容

There()no further business to discuss, we all went home.

A. is
B. was
C. being
D. would be

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We have to ask them to quit talking in order that all people present could hear us clearly().

A. decrease
B. cease
C. continue
D. keep

具有一对杂合基因的个体连续自交______代，才能使约97%的个体纯合。

A. 3
B. 5
C. 6
D. 7

玉米n+1的花粉不育，n+1的胚囊可育，已知R产生红色，r无色。在杂交RRr♀×rr♂中子代的表现型比例是______。

A. 1红:1无
B. 3红:1无
C. 5红:1无
D. 6红:1无

The recycling of aluminum conserves ninety-five percent of the energy needed to make new metal().

A. cleaning
B. reprocessing
C. reselling
D. crushing