keep 当意思为保持环境卫生整洁时 用 keep
keep clean是常用的词组
单项选择The earth is our house.We must _____ the land,air and wa
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相关问题
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The earth is our home. We must ______ the land, air and wate
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We are c__ Earth,the land,the air and the water.首字母填空,请问横线上应
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英语.单项选择单项选择（ ）1.If we don't the factory from _____the air,th
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The air b___worse and worse ,we must help our e____.首字母填空
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选词填空Water is the"life blood"of our earth．Like air and sunshi
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The earth is our home；we must take Care of it. This means ke
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单项选择1.we all know the truth _____ the earth goes round the s
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We must do everything we can_____our earth clearer and safer
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The moon _____ the earth and it is our satellite.
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单项选择（ ) 11.Which star is （ ）to the Earth,the sun or the Moon