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【单选题】
对HIV特性的描述不正确的是A.
有包膜的RNA病毒
B.
在体外仅感染表面CD4受体T细胞和巨噬细胞
C.
实验室中常使用巨噬细胞培养病毒
D.
病毒抵抗力较弱，56℃30分钟可灭活
E.
在室温病毒可存活7天
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皮皮学刷刷变学霸
举一反三
【单选题】He ____ Tokyo, for I saw him a short time ago.
A.
must have gone to
B.
mustn't have been to
C.
can't have gone to
D.
can't have been to
【单选题】He ______ to Tokyo, for I saw him a short time ago.
A.
must have gone
B.
mustn't have gone
C.
can't have gone
D.
shouldn't have gone
【单选题】I think it advisable that he _____ for Tokyo soon.
A.
will leave
B.
may leave
C.
leave
D.
leaves
【单选题】—_____ your brother speak Japanese? —Yes, he has learnt it in Tokyo for three years. [ ]
A.
Should
B.
Must
C.
Can
D.
May
【单选题】He will stay in Tokyo for ___________ days.
A.
a pair of
B.
a kind of
C.
a couple of
D.
a piece of
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