题目内容

Mary and Rose enjoyed _____ when they went skiing yesterday.

A. herself
B. yourselves
C. themselves
D. yourself

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I went to Beijing _____ my parents.

A. and
B. to
C. also
D. with

Mark is very funny and often makes us laugh into _____ .

A. sick
B. tears
C. face
D. smile

抗生素类药物的活性采用()来表示

A. 百分含量
B. 标示量百分含量
C. 效价单位
D. 浓度

抗生素有何特点？

A. 化学纯度高
B. 化学纯度低
C. 活性组分易变异
D. 稳定性差
E. 稳定性高