题目内容

It is very strange that whenever Brian does anything unexpected, his wife can always ascribe his behaviorthe external environment and sometimes to destiny.

A. to
B. at
C. under
D. in

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Until its eventual collapsethe weight of accumulated economic pressures, the system operated successfully for almost over 20 years.

A. out
B. in
C. over
D. under

Feelings, emotions, and desires must subordinate themselves reason because they sometimes could be irrational and biased.

A. at
B. to
C. in
D. over

下列哪种密码不编码氨基酸： ()。

A. 起始密码子
B. 色氨酸密码子
C. 甘氨酸密码子
D. 终止密码子

反密码子位于（）中。

A. mRNA
B. microRNA
C. rRNA
D. tRNA