问题
单项选择题
某垃圾填埋场渗沥水污染了地下水，而地下水的自净作用缓慢，其主要原因是
A．有机物含量高
B．有大量难分解的有机物
C．没有阳光，无法进行光解反应
D．流动缓慢，溶解氧少
E．温度较低
答案
参考答案：D
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某垃圾填埋场渗沥水污染了地下水，而地下水的自净作用缓慢，其主要原因是
A．有机物含量高
B．有大量难分解的有机物
C．没有阳光，无法进行光解反应
D．流动缓慢，溶解氧少
E．温度较低
参考答案：D
| 根据对话内容，选择正确的答案完成短文。 | ||||
| (T = Teacher W = Wang Hai) T: Who's on duty today? W: I am. T: Who isn't here today? W: Wang Yang. T: Aren't you Wang Yang? W: No, I'm not. I'm Wang Hai. I'm his brother. We are twins. T: Oh, sorry. I don't know you are twins. But where is Wang Yang? W: He is ill. He is at home. Can I look after him in the afternoon, Mr Li? T: Sure. W: Thank you. 1__________ is on duty today. He and his 2__________ are twins. But Wang Yang 3__________ 4__________ today. He is 5__________. Wang Hai will go and look after 6__________ this 7__________.
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