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【单选题】
在下列方程中为一元一次方程的是（ ）A.
x 2 +2x=6
B.
2x-y=1
C.
1 x =5
D.
3x-2=5
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举一反三
【简答题】It is difficult for him to make ( ) living . ( ) l iving in the city is expensive. ( ) l ife is short. It's reported that ( ) l ives were lost after a boat capsized.
【简答题】adv. 在背后; prep. 在......背后
【单选题】Never ________g iving thanks to your teachers who have helped you all the years .
A.
leave without
B.
c ontinue on
C.
reach for
D.
at the moment
【单选题】Jimmy earns his iving by works of art in the museum.
A.
recovering
B.
restoring
C.
renewing
D.
reviving
【判断题】L iving standards were converging among developing countries during 1990-2012 .
A.
正确
B.
错误
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