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简答题 __________.

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buildingmaterials。本题的出题点在情态动词处(should)。题干问在预防室内空气污染方面，_____应当被检查以避免潜在危害。讲座中提到As for indoor air polution。building materials should be reviewed forpotential harmful effects，故得答案building materials。

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1听音频，回答下列问题：
Mr. Green would like to live in the west coast of Canada NOT because

A．it is rich
B．it has pleasant climate
C．it has loads of coastline
D．it is near America

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2 Which of the following statements about traveling is TRUE according to Mr. Green?

A．Traveling is only a time for him to have a rest.
B．Traveling provides him with a lot of experience.
C．He is free from responsibility when traveling.
D．He changes a lot every time after traveling.

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3 Why does Mr. Green often travel with other people he knows well?

A．Because he will have someone to talk with during the trip.
B．Because traveling alone is dangerous.
C．Because the expense can be reduced in this way.
D．Because they have many similarities.

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