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题型：单选题 题类：模拟题 难易度：普通
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It's a good habit for us {#blank#}1{#/blank#} {#blank#}2{#/blank#} the waste into different groups so that it can be easily recycled.
{#blank#}1{#/blank#} {#blank#}2{#/blank#} very important for us {#blank#}3{#/blank#} {#blank#}4{#/blank#} medical workers.
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