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A. before
B. after
C. in front of
D. behind
机体受药物刺激发生异常免疫反应,称之为
A. 副作用
B. 特异质反应
C. 毒性反应
D. 变态反应
E. 后遗效应
We are happy()we are not very rich.
A. however
B. though
C. but
D. even if
Teacher: Where is Tom this morningJohn: He’ s got a cold.Teacher: ()