单项选择题

______ almost every major city in the world.

A．Air pollution that now afflicts
B．Not only does air pollution now afflict
C．Air pollution now afflicts
D．Air pollution is now afflicted
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单项选择题
—I'd like to get a break from studying.—Let's take the afternoon off and go to town. You can get some shopping done.—______—Well, I definitely don't want to go to the mall.
A．I'd rather go to the mall for the farmers' market.
B．You are so kind that I feel guilty if I say no.
C．I'd rather stay at home to DIY some furniture project.
D．Are you kidding One afternoon shopping for a break
单项选择题
At each end of the tube ______, one which gathers light and one which magnifies the image.
A．are two lenses there
B．two lenses are
C．are two lenses
D．two lenses are there
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