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
I like all kinds of chocolate, especially bitter chocolate. So when Mother had bought one, I couldn’t help thinking about 36 . I was helping Father in the yard when suddenly I got an idea. I could cut a piece 37 that chocolate without anyone knowing it. I waited 38 Mother went outside feeding the chickens. Then I told Father I wanted to go for a drink of water. I went into the room and got the 39 down. Just when I had the knife ready to cut, I heard Mother coming. So I had to put the chocolate 40 into my shirt, went to my mom and 41 the chocolate there. And then I went back to 42 Father. All the rest of the afternoon, I didn’t dare to look at Father. Every time he spoke, it made me jump. My hands began shaking and my heart started 43 fast. I didn’t want the chocolate any more. I 44 wanted to get a chance to put it back. Have you ever had a similar 45 ?
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