The World Health Organization has given some advice on        to protect us from being infected(感染) with H7N9.
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A
how
B
what
C
where
D
when
推荐题目
We should plant more trees to make our city         .
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A
beautiful
B
beautifully
C
serious
D
noisy
My bother often makes his teacher ____________.
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A
happy
B
happily
C
happiness
D
angrily
Mozart is a well-known pianist in the world.
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A
world-famous
B
talented
C
smart
D
clever