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【单选题】
下列关于水下侦察监视系统的描述，错误的是()。A.
对水下活动目标进行侦察监视
B.
其最主要目标是水下的渔船
C.
有水声探测设备
D.
有非水声探测设备
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举一反三
【单选题】He must have left yesterday,_______ ?
A.
did he
B.
didn't he
C.
hasn't he
D.
mustn't he
【简答题】--“______ he have left yesterday?” --“Yes, he ______ yesterday.” --“No, he ______ yesterday.”A. Must; must have left;
can’t have left B. Can; can have left; can’t have left C. Can; must have left;
can...
【单选题】The police have______that he must have left his apartment yesterday evening.
A.
induced
B.
deduced
C.
reduced
D.
seduced
【单选题】The light in his office is out. He_________ left for home.
A.
must have
B.
must have been
C.
should have
D.
should have been
【单选题】由于人类活动排放至大气中的污染物会引起臭氧层破坏，引起大气臭氧层破坏的主要污染物是( )。
A.
汽车排出废气中的二氧化碳
B.
燃煤电厂排出的二氧化硫
C.
制造业排出的氟氯烃化合物
D.
锅炉房排出的烟尘
【多选题】由于人类活动排放至大气中的污染物会引起臭氧层破坏，引起大气臭氧层破坏的主要污染物是( )。
A.
汽车排出废气中的二氧化碳
B.
燃煤电厂排出的二氧化硫
C.
制造厂排出的氟氯烃化合物
D.
锅炉房排出的烟尘
E.
含硫燃料的不完全燃烧剩余的气体
【单选题】．—Steve come back because the window is open． —Yes．but he _______left it open last night．
A.
must have；might have
B.
might have；can’t have
C.
can have；should have
D.
might；must have
【简答题】肺泡上皮由 细胞和 细胞组成。
【单选题】--- Daniel must have lost his job in that unemployment crisis, __________he? --- I don’t think so．Yesterday I saw him working together with his colleagues.
A.
didn’t
B.
doesn’t
C.
mustn’t
D.
hasn’t
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