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举一反三
【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food．Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...
A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.
【单选题】熏蒸剂利用杀虫剂的（），所以（），操作人员（）
A.
有毒蒸汽杀虫，必须在密闭环境中进行，必须撤离现场
B.
有毒蒸汽杀虫，不必在密闭环境中进行，不必撤离现场
C.
挥发出的气体毒杀有害生物，不必在密闭环境中进行，不必撤离现场
D.
挥发出的气体毒杀有害生物，必须在密闭环境中进行，必须撤离现场