细心的你会发现菜农卖菜时,会不时地往青菜上洒水,这样做的目的是[ ]
A.增加青菜重量
B.有利于水分散失
C.青菜细胞吸水,使青菜新鲜
D.使青菜干净
答案:C
At the airport I recognized her easily because her red hair _______ in the crowd.[ ]
A. stood up
B. stood out
C. stood for
D. stood by
处于恢复期的病人不再作为传染源排出病原体的传染病是()
A.痢疾
B.伤寒
C.水痘
D.乙型肝炎
E.白喉