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【B15】

A. doubt
B. suspicion
C. trouble
D. difficulty

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终止密码子(termination codon)

A．The man should wait a minute.B．It's too late for the man to register.C．The man shoul

A. The man should wait a minute.
B. It's too late for the man to register.
C. The man should have done things earlier.
D. There might still be a chance even if it is the last minute.

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The march to Washington, D.C. in 1963 helped the passage of two civil rights acts.

A. Y
B. N
C. NG

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在蛋白质生物合成中，催化氨基酸活化的酶是______。

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【B15】

A. doubt B. suspicion C. trouble D. difficulty

终止密码子(termination codon)

A．The man should wait a minute.B．It's too late for the man to register.C．The man shoul

The march to Washington, D.C. in 1963 helped the passage of two civil rights acts.

在蛋白质生物合成中，催化氨基酸活化的酶是______。

A. doubt
B. suspicion
C. trouble
D. difficulty