【名词&注释】
二氧化硫、二氧化碳
[单选题]为了经久耐用，在灯泡中可填充的气体是
A. 氧气
B. 氮气
C. 二氧化碳
D. 二氧化硫
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举一反三：
[单选题]People who like dancing can come at____________.
A. 7:45 p.m.
B. 11:45 a.m.
C. 12:15 p.m.
D. 2:00 p.m.
[单选题]How long did he spend on his way to the place for his performance?
A. One hour. B． Two hours.
B. four hours and three quarters. D． One hour and a quarter.
[单选题]
A. watering
B. shining
C. wondering
D. shaking
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