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【单选题】
增强子的作用特点是:A.
只在真核细胞中发挥作用
B.
有固定的序列，必须在启动子上游
C.
有严格的专一性
D.
无需与蛋白质因子结合即可发挥作用
E.
作用无方向性
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举一反三
【单选题】I wish that you ______ such a bad headache, then you would have enjoyed the concert. [ ]
A.
hadn't had
B.
didn't have
C.
shouldn't have
D.
won't have
【单选题】Some people believe that if you ______ a mirror, you ______ have seven years of bad luck.
A.
break will
B.
will break would
C.
break would
D.
broke will
【单选题】If you _____ what he said, you could have avoided repeating such a bad mistake.
A.
paid attention to
B.
had paid attention to
C.
noticed
D.
had noticed to
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