问题
单项选择题
机械工厂下列废水中重金属污染物主要来源于（）。
A．涂装废水
B．电镀、阳极氧化、印制电路板制作等生产废水
C．机械加工废切削液
D．锅炉房冲渣废水
答案
参考答案：B
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机械工厂下列废水中重金属污染物主要来源于（）。
A．涂装废水
B．电镀、阳极氧化、印制电路板制作等生产废水
C．机械加工废切削液
D．锅炉房冲渣废水
参考答案：B
| 完型填空。 | ||||
| Mary is a little fatter than she wants to 1___________. She 2___________ to lose some weight (减肥). So she is on diet (节食). She tries not to eat too 3___________. She eats very few sweets 4___________ it will make her 5___________. She does exercise every 6___________. She swims very often, and she runs about two kilometres a day. Now she is very happy because she is thinner than 7___________. Mary's sister is young and thin. She does 8___________ every day, too. She doesn't 9___________ much meat. But she eats a lot of fruit and vegetables because she thinks they are good 10___________ her health.
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