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【单选题】
在相对封闭的房间内发生火灾时A.
不能随便开启门窗
B.
只能开门
C.
只能开窗
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反馈参考答案：
举一反三
【单选题】Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.
A.
waited, happened
B.
have waited, has happened
C.
had waited, was happened
D.
had been waiting, had happened
【单选题】下列等式中成的有（ ） ①sin30°+sin30°=sin60°；②若cosA=sinB，则∠A=∠B；③若sinA=cos30°，则锐角A=60°；④sin60°+sin30°=2（sin30°+cos30°）．
A.
0个
B.
1个
C.
2个
D.
3个
【单选题】The old man started living in the old house ______Tom was born.
A.
as soon as
B.
long, long before
C.
soon after
D.
years after
【单选题】It was (acted starred started) by Tom Cruse and Renee Zellewager.
A.
acted
B.
starred
C.
started
【单选题】With everything ________, the teacher started the slide show.
A.
in the place of
B.
in places
C.
in the place
D.
in place
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