试题 试卷
题型：单选题 题类：常考题 难易度：普通
广东中考人教新目标（Go for it）九年级Units10－12教材梳理
—No, they are ______ difficult for me______ take care of.
Alice didn't know {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} {#blank#}5{#/blank#}.
—Yes. They can take harmful gases and provide us ______ oxygen.
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