问题描述：
in big cities,air p______is quite serious.
one of the v_____hurt herself on her way to the sunmmer palace.
mountain tai is over 1500M______above sea level.
in f______,all the students don't feel like d______too much homework.
we should s______more than one l_______tomorrow.
one of the v_____hurt herself on her way to the sunmmer palace.
mountain tai is over 1500M______above sea level.
in f______,all the students don't feel like d______too much homework.
we should s______more than one l_______tomorrow.
问题解答：
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