Only 16 percent of China's area ____ covered with forests, so ____of us should protect trees.

题型：单选题题类：模拟题难易度：普通

A、are; every B、is; each C、is; everyone D、are; each

举一反三

—I'm afraid I can't it, Daddy. It's too high.

—Because their children are so busy with the work that they can't spend much time with them.

—Yes. I often go walking there.

—______ them ______ over twenty

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