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電子課本網(wǎng) › 第77頁

第77頁

信息發(fā)布者：

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2
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dirty
dead 
rubbish
messy
keep
bin
metro
air
plant
S1: What makes the air dirty?
S2: The smoke from the cars makes the air dirty.
S1: What can we do to keep the air clean?
S2: We can walk to school and plant more trees.
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