问题
单项选择题
CK是由2个亚单位组成的二聚体，产生的同工酶有
A．2种
B．3种
C．4种
D．5种
E．6种
答案
参考答案：B
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CK是由2个亚单位组成的二聚体，产生的同工酶有
A．2种
B．3种
C．4种
D．5种
E．6种
参考答案：B
A strange thing happened to Henry yesterday. He was on a bus and to ____. So he stood up and rang the bell. ____ make sure the driver heard him, he rang it twice, but the bus ____ stop. And the conductor came and shouted ____ him. The conductor was ___ angry and spoke ____ fast that Henry didn’t understand ____. The bus stopped at the next bus and Henry got off. As he got off he heard someone said, ― “I think he ____ a foreigner.” When Henry got ____, he told his wife about it. ― “____ times did you ring the bell?” his wife asked. ―” Twice,” said Henry. ― “Well, that’s the signal (信号) ____ the driver ____ on.”‖His wife explained, ―”only the conductor ____ to ring the bell twice. That’s why the conductor ____ so angry! “ Henry nodded（点头）. ― “____, “he said.
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