2011年世界水日的主题是“城市用水：应对都市化挑战”．如图表示_爱下问搜题

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问题问答题

2011年世界水日的主题是“城市用水：应对都市化挑战”．如图表示成都市饮用水的净化过程，请回答下列问题：

（1）构成物质的基本微粒有分子、原子、离子．从微粒角度看水是由构成的．

（2）在图中的沉淀池中，除了用静置的方法外，还可以用方法使水更干净．

（3）水质检验后，如果自来水在传输过程中存在细菌污染，人们在家中饮用该水之前应该如何处理？．

（4）有些城市使用的是地下水，地下水中的细菌和颗粒等杂质比湖水、河水等地表水中的少，请说出一个原因．但地下水多是硬水，会给生活和生产带来麻烦，检验地下水是硬水还是软水，可用的物质是．

（5）在实验室中，我们一般可使用的方法来制取净化程度较高的水．

魔方格

答案

略

单项选择题

农行网上支付后台管理系统一级分行B2C管理功能中，“网上通知B2C商户”填写通知标题和通知内容，通知内容（）。

A、最多500字

B、最多1000字

C、最多1500字

D、无限制

完形填空

It was at a concert that I happened to find David. He was holding his head at a strange   36  as if he were staring down at something. Then the truth 37 me. He was blind. The last thing he remembers seeingwas his daughter being born. Then the whole world went   38 .
Bad luck is no stranger to this 44-year-old man. His mother died of cancer, and his weak father had to 39 11-year-old David to the 40 of the state.
Things seemed always to go for   41  . Two years ago, his beloved guide dog pulled him out of the pathof a truck. David was not 42 . The dog died.
But David does not feel sorry for himself. “These are just little obstacles(障碍困难) you have to   43  in your life,” he said.
He has to make a daily two-hour trip to his working place—the X-ray department of an 44  room. It was a hard job to 45 by. Before he got it, David was determined to escape the workshop run by the Lighthouse, an organization   46  to helping blind people. He wanted a job of developing X-ray film, a job   47   everyone, not just he, must work in the dark, including those with 48 eyesight. The Lighthouse called many hospitals, with no result,   49 they offered to pay his first three months’ salary.
David works alone in a dark room that   50  of chemicals. He doesn’t wear gloves. Otherwise, he could not feel. 51  this is an emergency room, lives can be put either   52  or out of danger. His director says he trusts him 100 percent.
He makes $20,000 a year. But his motivation goes   53 money. “By working I can realize my own   54 . That’s what really counts!” he said.
What a shining example for us to   55 !

A．angle(角度)

B．information

D．underground

D．even though

A．disadvantage