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【单选题】
物体从距凸透镜12cm处移动到距凸透镜21cm处，调整光屏的位置，总能在光屏上得到倒立、放大的像．由此可知此凸透镜的焦距可能是（ ）A.
10cm
B.
12cm
C.
20cm
D.
以上都不对
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举一反三
【单选题】What did New World mean?
A.
It was a place where they could learn new farming method.
B.
It was a place where they could worship God in their own way.
C.
It was a place where they could establish a new religion.
D.
It was a place where they could travel.
【单选题】There is useful book and interesting magazine on the desk. They are my brother’s.
A.
a, an, all
B.
a, a, both
C.
a, an, both
D.
an, a ,all
【单选题】某同学效游不慎被蜜蜂蛰伤，已知蜜蜂蛰人时分泌的液体是酸性的．该同学随身携带的物品有苹果汁、牛奶、矿泉水和香皂等，其pH分别为a、b、c、d（如图所示，d为香皂水的pH），为了减轻蛰伤处的疼痛，应涂沫（ ）
A.
苹果汁
B.
牛奶
C.
矿泉水
D.
香皂水
【单选题】What did they do with the new CD covers?
A.
They like to collect the new CD covers.
B.
They don't care the new CD covers.
C.
They just talked about the covers they liked.
D.
They pay a lot attention on choosing a new CD cover.
【单选题】How is yor new job going?
A.
i'm fine, thank you.
B.
perfect
C.
How are you?
D.
yes, i am fine.
【单选题】There __ a magazine, a few letters and some newspapers on the table, but there ___ a few letters, a magazine and some newspapers on the sofa.
A.
is, is
B.
are, are
C.
is, are
D.
are, is
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