单项选择 适中0.65 引用2 组卷311
—What does PM 2. 5 mean？
—It's a professional_____________ indicating the condition of air pollution.
—It's a professional_____________ indicating the condition of air pollution.
| A．number | B．mark |
| C．term | D．item |
14-15高三·浙江杭州·课时练习
类题推荐
—What does PM 2. 5 mean？
—It's a professional_____________ indicating the condition of air pollution.
—It's a professional_____________ indicating the condition of air pollution.
| A．number | B．mark |
| C．term | D．item |
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