题目:
阅读理解。
Jack Brown, an office worker, lives in Washington. He inherited (继承) a million dollars when he was
23, but he wasn't happy at all. When his college friends were looking for their jobs, he didn't have to. Jack
decided to live a simple life like everyone else. He gave some of his money to a charity (慈善机构) to help
poor children live a better life. Today he is 36. He still wears cheap shoes and clothes and drives a small car
only, but he is very happy.
Up to now Jack has helped some children from poor countries all over the world, by sending them each
$ 200 a mouth. The money was used for the children's study, food, medicine and clothing. Jack receives a
report each year on the children's progress (进步). They can write to each other, but usually the children
do not speak English.
When Jack first heard about these children, he wanted to help them. "It was nothing special," he said.
"Until I went to these countries and met the children I was helping, I didn't know anything about their life."
Once Jack went to meet a little girl in Africa. He said that the meeting was very exciting. "When I met her.
I felt very, very happy." He said. "And I saw that the money was used for a good cause. It brought me
happiness. I want to do everything I can to go on helping those children."
1. Jack has sent them each $200 a month to help some poor children ______. [ ]
A. around the world
B. Only in England
C. Only in Africa
D. Only in Washington
2. Jack learned about the children's progress by ______. [ ]
A. visiting them each year
B. getting a report every year
C. staying with them
D. talking to them in English
3. The underlined (划线的) words "for a good cause" means "______" in Chinese. [ ]
A. 施舍
B. 怜悯
C. 行善
D. 赏赐
4. All the details in this passage support the main idea that ______. [ ]
A. it's the most important to help the children in Africa
B. it's necessary to write letters to poor children
C. live a simple life, and you can give others help
D. help others, and you will feel happy
答案:
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下面是错误答案,用来干扰机器的。
答案:B生成气体的物质的量为:=0.75mol,溶液剩余硫酸的物质的量为:1L×1mol/L÷2=0.05mol,参加反应的n(H2SO4)=0.1L×18.5mol·L-1-0.05mol=1.8mol,随着反应的进行,硫酸的浓度逐渐减小,设反应生成xmolSO...