我们饮用的水是原水净化所得，自来水厂科学合理的净水过程是（ ）
A．原水→加絮凝剂→沉淀→过滤→吸附→消毒→净水
B．原水→加絮凝剂→消毒→过滤→沉淀→吸附→净水
C．原水→过滤→消毒→加絮凝剂→吸附→沉淀→净水
D．原水→消毒→加絮凝剂→吸附→沉淀→过滤→净水
根据自来水的净化过程，取得的原水经过加明矾絮凝剂使不溶性固体沉淀，然后经过过滤除去小颗粒不溶性固体，经过活性炭的吸附除去水中的异味和色素，再加氯水进行消毒，即可得到自来水，观察选项，故选A．
根据短文内容，用方框中所给词语的适当形式填空，使文章通顺，完整。（每词限用一次）
"Chinese 小题1: hope very much to go abroad to get a wider view(视野) of the world," said Li Mingshan, a Chinese writer who has lived 小题2: America for many years. In a talk Li told more than 300 parents and their children that life in foreign countries can be 小题3:for young people. "They have to meet a culture shock and language problems.”However, these are not the most difficult things. To most children, looking after 小题4:when studying alone in a foreign country is a big challenge(挑战).Zhao Baohua, a 16-year-old student 小题5: to study in a high school in Australia las t October. To his surprise, his teachers there hardly pushed students to study. And usually there wasn't homework. "With these education systems, we have more free 小题6: and more space for thinking," said Zhao. "But 小题7: you don't know how to plan your time and money, you will not have an easy time." Some of his friends spent their whole year's money in the first two months of the term, and they didn't 小题8: their exams."Studying abroad at a young age can help students learn foreign languages 小题9:, but students and parents should know about the challenges," Li said. "If you want to study abroad, try to talk to someone with experience in foreign countries. Make sure that you are 小题10: for it. " |