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【简答题】
紫外线照射能使 DNA相邻碱基形成_____,从而导致DNA复制产生错误。
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举一反三
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
them
B.
that
C.
be back
D.
or not
【简答题】A Letter to a Friend 1．Telling his friend that he was pleased to be admitted to Yale University17． A Letter to a Friend 1．Telling his friend that he was pleased to be admitted to Yale University 2．Me...
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
say
B.
that
C.
be back
D.
or not
【简答题】A．Put a stamp on the letter. B．Make his letter shorter. C．Keep working on the letter. D．Send the letter as it is.
【单选题】Last summer the author got a letter from a man asking to cancel his wife's subscription.
A.
Y
B.
N
C.
NG
【单选题】--Why did he cry yesterday?--He was excited, for he ______ his mother’s letter.
A.
expected
B.
was expecting
C.
had expected
D.
had been expecting
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