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师梦圆初中英语教材同步人教版九年级全一册Section B 3a—3b Self check下载详情
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内容预览

Animals are killed by people.

People _______animals.

kill

The air is polluted by factories.

Factories _________ the air.

pollute

Trees are cut down by people.

People __________ trees.

cut down

The soil is carried away by wind.

水 土 流 失

Wind carry away the soil.

Litter is dropped by people.

People ______ litter.

drop

A+

be done

+ by

B

被动语态

Animals are killed

The air is polluted

The soil is carried away

Litter is dropped

Trees are cut down

( )

by people.

by factories.

by people.

by wind.

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