我国生活饮用水卫生标准中分别对铁和挥发酚、氟化物、游离性余氯都作出了明确的限量要求，这些指标为（）
A.感官性状和一般化学指标、毒理学指标、细菌学指标
B.特殊化学指标、毒理学指标、细菌学指标
C.一般化学指标、特殊化学指标、毒理学指标
D.感官性状指标、特殊化学指标、细菌学指标
E.感官性状和一般化学指标、微量元素指标、细菌学指标
参考答案：A
Dear Jenny． How is it going? Are you busy with your study these days? I've been back at school nearly four weeks. I am very glad to tell you that great have taken place in our school this term. First of all, we are aked to "clean our plates" when having our meals and say to waste. Some of us used to order more than what we could eat. That was a big waste of food and money. Now we need to the food we order. We should also stop wasting in some other ways. For example, we should turn off the lights when we the classroom. And our school has opened up some for us to learn how to grow vegetables. Each class is given a small garden and our class has to grow some tomatoes and beans in our spare time. I think it'll be very interesting. Maybe I'II be able to you some beans we've grown next time. What's more, we have only two classes in the afternoon we have more time for after-school activities. I am one of the traffic safety volunteers in our school. After school, we take turns asking people in the streets near our school to the traffic rules. I think our school life is now improving! Please write back soon and tell me more about your school. Yours truly, Wang Wei
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