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【单选题】
下列关于遗传密码的描述哪一项是错误的:A.
密码阅读有方向性，5'端开始，3'端终止
B.
密码第3位（即3'端）碱基与反密码子的第1位（即5'端）碱基配对具有一定自由度，有时会出现多对一的情况。
C.
一种氨基酸只能有一种密码子
D.
一种密码子只代表一种氨基酸
E.
有61个密码子编码氨基酸
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A.
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B.
A technician.
C.
A director.
D.
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A.
轻症中暑，中度中暑和重症中暑
B.
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C.
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D.
轻症中暑、重症中暑
E.
以上都不是
【单选题】When they my name in the commencement ceremony, I started to weep.
A.
shouted
B.
cried
C.
spoke
D.
announced
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