问题 选择题

已知在空气中完全燃烧1.6g某纯净物生成4.4gCO2和3.6H2O,则该纯净物的组成中(  )

A.只有C元素

B.只有C、H元素

C.只有C、H、O元素

D.都不正确

答案

由题意可知在反应物中一定含有的元素有碳元素和氢元素.

则4.4g CO2中含有碳元素的质量为:4.4g×

12
44
×100%=1.2g

3.6g H2O中含有氢元素的质量为:3.6g×

2
18
×100%=0.4g

又因1.2g+0.4g=1.6g

由于碳氢元素的质量和与该纯净物质量相等,所以有机物中一定不含氧元素.

故选B

完形填空

Sense of humor is just one of the many things shared by Alfred and Anthony Melillo, 64-year-old twin brothers from East Haven who made history in February 2012. On Christmas Eve, 2002, Anthony had a heart transplant(移植)from a 21-year-old donor(捐赠者). Two days before Valentine’s Day in 2012, Alfred received a 19-year-old heart, marking the first time on record that twin adults each received heart transplants.

“I’m 15 minutes older than him. But now I’m younger because of my heart and I’m not going to respect him, ”Alfred said with a smile, pointing to his brother while talking to a roomful of reporters, who laughed frequently at their jokes.

While the twins knew that genetics(遗传学)might have played a role in their condition, they recognized that their bad eating habits might have also contributed to their heart problems. “We’d put half a pound of butter on a steak. I overdid it on all the food that tasted good, so I guess I deserved what I got for not dieting properly. ”

The discussion moved to Anthony’s recovery. In the five years since his heart transplant, he had been on an exercise program where he regularly rode a bicycle for five miles, swam each day, and walked a couple of miles. He was still on medication(药物治疗)but not nearly as much as Alfred, who was just in the early stage of his recovery.

Alfred said his goal, of course, was to feel even better than his brother. “But”, he added, “I love my brother very much. We’re very close and I’m sure we’ll do just fine. ”

小题1:What is this passage about? (within 10 words)

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小题2:What did Alfred and Anthony have in common in character according to Paragraph 1? (within 7 words)

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小题3:Why did Alfred say he was younger than Anthony? (within 8 words)

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小题4:What were the most probable two causes of the brothers’heart problem? (within 6 words)

                                                                  

小题5:What did Anthony do for five years after his operation? (within 7 words)

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名词解释