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【单选题】
关于活疫苗的叙述，错误的一项是A.
活疫苗是经人工培养使病原菌毒力发生变异或由自然界直接筛选出的
B.
活疫苗能在机体内繁殖并可抑制或干扰野毒株的增殖和致病性
C.
活疫苗比死疫苗用量小
D.
活疫苗可刺激机体产生特异性免疫，其维持时间一般比死疫苗长
E.
活疫苗比死疫苗易保存
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举一反三
【单选题】Tom insisted _____ history instead of business at university, but his mother insisted that he _____ her advice. [ ]
A.
on studying, take
B.
to study, must take
C.
on studying, took
D.
in studying, should take
【单选题】His government insisted that he ______until he finished his degree.
A.
would stay
B.
stay
C.
stayed
D.
shall stay
【单选题】Both of his parents insisted that he _______ get on well with his lessons and that he ______ given more extra classes at weekends.
A.
didn’t; be
B.
didn’t; was
C.
doesn’t; should be
D.
didn’t; would be
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