问题
单项选择题
按污染源释放的有害物种类可将污染源分为（）。
A、点污染源、面污染源和扩散污染源
B、物理性（如热和放射性物质）污染源、化学性（无机物和有机物）污染源、生物性（如菌、病毒）污染源
C、工业污染源和生活污染源
D、天然污染源和人为污染源
答案
参考答案：B
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按污染源释放的有害物种类可将污染源分为（）。
A、点污染源、面污染源和扩散污染源
B、物理性（如热和放射性物质）污染源、化学性（无机物和有机物）污染源、生物性（如菌、病毒）污染源
C、工业污染源和生活污染源
D、天然污染源和人为污染源
参考答案：B
| 句型转换。 |
| 1. I don't think his answer is right. (改为肯定句) I _____ his answer _____ right. 2. Tom often reads famous books about history. (改为一般疑问句) _____ Tom often _____ famous books about history? 3. Jack is flying a kite right now.(对画线部分提问) _____ is Jack _____ right now? 4. Jane does her homework every day.(改为否定句) Jane _____ _____ her homework every day. 5. It's sunny today.(对画线部分提问) _____ is the _____ today? |