（2014重庆一中高三下第三次月考）13. There are many smokers in China, _____ the number of students who pick up this habit _____ increased a lot.
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A
A. where; has
B
which; has
C
here; have
D
s; have
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(2013·安徽，21)From space, the earth looks blue.This is ________about seventy－one percent of its surface is covered by water.
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why
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how
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because
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Cleaning
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To clean
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will rain
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in that
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in which
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that
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where
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that
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where
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whether