【单选题】【消耗次数：1】
14.We should plant trees on _______ side of the road.
①
each
②
some
③
every
④
many
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相关题目
【单选题】
Although they plant trees in this area every year, the tops of some hills are still ______.
①
blank
②
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vacant
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We should be pleased to send you some samples of our new printers on approval, _______ our own expenses.
①
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①
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as polite as possible
②
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④
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— Its very windy and dusty in Beijing .
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①
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③
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③
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同一条无差异曲线上的不同点表示
①
效用水平不同，但两种商品的组合比例相同
②
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③
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①
75
②
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③
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④
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