【名词&注释】
天然气(natural gas)
[填空题]③从下表数据分析，与煤相比，用天然气做燃料的优点是 。
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举一反三：
[单选题]10．—_________are you staying?—For a week．
A. How long
B. How soon
C. How often
D. How many
[单选题]Whenhe_________,heputiton.
A. gottotheoffice
B. gothome
C. wenttowork
D. wenttotheshop
[单选题]They waited and waited for something _________ to happen.
A. excite
B. excited
C. exciting
D. to excite
[单选题]19． —Does your brother get up early?—_______But he gets up late on weekends．
A. Yes， he does
B. No， he doesn’t
C. Yes， he doesn’t
D. No，he does
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