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【单选题】
食品毒理学评价中,属于第四阶段实验是( )A.
急性毒性试验
B.
遗传毒性试验
C.
亚慢性毒性实验
D.
慢性毒性实验
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【单选题】听力原文：M: Professor Linda，we were wondering if we could sit in on your English class. W: I wish I could say yes，but if I accepted you two，I wouldn't know how to say no to a lot of others who have made t...
A.
She rejects their request.
B.
She accepts their request.
C.
She agrees to consider their request.
D.
She asks them to come with the others.
【单选题】There was _____to prevent the accident .
A.
something could do
B.
anything we could do
C.
nothing we couldn’t do
D.
nothing we could do
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