题目内容

引起胆囊收缩的一个重要体液因素是______。

A. 胆盐
B. 盐酸
C. 促胰液素
D. 促胰酶素

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As a result ______ the air traffic controllers' strike all flights have been diverted to alternative destinations.

A. with
B. from
C. of
D. for

Sometimes very young children have trouble ______ fact from fiction and may believe that such things actually exist.

A. separating B. having separated
B. C. to separate
C. for separating

解放区军民经过8个月的作战，粉碎了国民党的全面进攻的主要作战方法是( )。

A. 蘑菇战
B. 游击战
C. 运动战
D. 阵地战

可使蛋白质二硫键发生断裂的试剂是______。

A. 尿素
B. 巯基乙醇
C. 溴化氰
D. SDS