问题 填空题

在农村人们常常饮用河水,河水中常含有大量的泥沙、悬浮物和细菌等杂质,一般可用次氯酸杀死细菌.将漂白粉(主要成分是次氯酸钙)溶于水可生成氯化钙和次氯酸.下列是某户居民在饮用水之前对河水的处理步骤:河水→A(加入明矾)→B(沉淀)→C(过滤)→D(加入漂白粉)→净水

(1)能够消毒、杀菌的步骤是 _________ ;(填序号)

(2)该农户得到的净水是 _________ 物,原因是 _________

(3)该农户得到的净水是硬水还是软水,只要加 _________ 就可以区别;

(4)在过滤时,若经过两次过滤后滤液仍然浑浊,其原因可能是 _________ _________ . (要求写出两个方面的原因).

答案

(1)D;

(2)混合物;水中还有很多可溶性物质存在;

(3)肥皂水;

(4)滤纸破损;液面高于滤纸边缘

阅读理解

A thief who dropped a winning lottery ticket( * * )at the scene of his crime has been given a lesson in honesty. His victim, who picked up the ticket, then claimed the £25000 prize, managed to trace him, and handed over the cash. The robbery happened when maths professor Vinicio Sabbatucci, 58, was changing a tyre on an Italian motorway. Another motorist, who stopped to “to help”, stole a suitcase from his car and drove off. The professor found the dropped ticket and put it in his pocket before driving home to Ascoli in eastern Italy.

Next day, he saw the lottery results on TV and, taking out the ticket, realized it was a winner. He claimed the 60 million lire(里拉) prize. Then he began a battle with his conscience. Finally, he decided he could not keep the money despite having been robbed. He advertised in newspapers and on radio, saying: “I’m trying to find the man who robbed me. I have 60 million lire for him--- a lottery win. Please meet me. Anonymity(匿名) guaranteed.”

Professor Sabbatucci received hundreds of calls from people hoping to trick him into handing them the cash. But there was one voice he recognized--- and he arranged to meet the man in a park. The robber, a 35-year-old unemployed father of two, gave back the suitcase and burst into tears. He could not believe what was happening. “Why didn’t you keep the money?” he asked. The professor replied: “I couldn’t because it’s not mine.” Then he walked off, spurning the thief’s offer of a reward.

65.The sentence “ Then he began a battle with his conscience.” In paragraph 2 implies all of the following EXCEPT that_______.

A. he knew what he should do as soon as he saw the lottery results

B. he hesitated about keeping the money for some time

C. he thought for a moment of avenging himself on the robber

D. he came to realize that honesty is more important than money

66. Hundreds of people phoned professor Sabbatucci because they  ______.

A. wanted to make fun of him  B. hoped to get the money

C. knew who the robber was   D. lost the lottery ticket

67. The word “spurning” in the last sentence can be replaced by  ______.

A. accepting  B. claiming   C. rejecting   D. canceling

68. If the story appears in a newspaper, the best title might be_____.

A. A Thief’s Lucky Day   B. A Popular Maths Professor

C. A Magic Lottery       D. A Reward of Honesty

单项选择题