题目内容

引起着色性干皮病的原因是

A. DNA上TT二聚体的切除修复系统有缺陷
B. 细胞膜通透性缺陷引起迅速失水
C. 紫外光照射诱导丁有毒性的前病毒
D. 温度敏感性转移酶失活
E. 维生素B1缺乏

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This text isn' t so ______ as that one.

A. easy
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C. easiest
D. easily

Newborn babies die ______ in Africa's poor areas.

A. more or less
B. no less than
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What does not contribute to an actor's performance in a movie

A. The directions of the movie director.
B. The support of the firm crew.
C. The effort of the actor.
D. The editing of the movie.

If it wasn' t an accident, he must have done it on ______.

A. fault
B. purpose
C. mistake
D. intention

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