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题型：翻译 题类：常考题 难易度：普通
The air in the mountains is {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} in the cities.
A large {#blank#}1{#/blank#} {#blank#}2{#/blank#} information can be stored on the Internet.
The classroom building is {#blank#}1{#/blank#} {#blank#}2{#/blank#} the school hall.
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