问题 选择题

设NA为阿伏加德罗常数的值,下列叙述正确的是    

A.标准状况下,33.6 L氟化氢中含有氟原子的数目为1.5NA

B.常温常压下,7.0 g乙烯与丙烯的混合物中含有氢原子的数目为NA

C.1 mol Al3离子含有的核外电子数为3NA

D.某密闭容器盛有0.1 mol N2和0.3 mol H2,在一定条件下充分反应,转移电子的数目为0.6NA

答案

答案:B

解题的关键有两点:(1)HF在标准状况下的状态;(2)可逆反应不能进行到底。HF在标准状况下为液体,故A错;乙烯与丙烯的混合物可以看成是由“CH2”组成的,7.0 g乙烯与丙烯的混合物的物质的量为0.5 mol,含有的H原子的物质的量为1 mol,故B正确;C项1个Al3核外电子数为10,则1 mol Al3所含有的核外电子数为10 mol(即10NA),故C错;因N2和H2的反应为可逆反应,反应不能进行到底,故D错。答案选B。

选择题
阅读理解

The key to learning English well is to overcome your shyness and fear , said taxi driver Zhang, who is attending the English training program run by the West Lake Taxi Company. “Out teacher Mrs.Yang encourages us many times to open our mouths and speak English out loudly in her class ,” said Zhang.

Chen Zhong, another fluent(流利的) English speaker, shared his opinion. “I didn’t think English was important to us at the beginning since many foreign passengers could speak some Chinese to me. But when I did speak some English, the foreigners were always pleased and said I was the first taxi driver they had met who could speak English.

Chen said he found studying English extremely interesting. The 160 minutes’ study per week was simply not enough for him. He bought books , tapes and VCDs to learn English on his own.. “Though it cost me a lot of time and energy , I did find it is useful in the long term” he said.

The reward of learning English is more than Chen has expected. Now he has made several foreign friends who book his taxi when they need. Some foreign passengers even give him tips (小费when he communicates with them in English.

To facilitate their studies, the company developed a bilingual(双语的) tape which includes the most frequently used sentences for taxi drivers and the names of major streets and buildings in Shenzhen.

“It has helped me out, ” said Chen. “Once I failed to express ‘Chinese Folk Culture Villages’ in English when I was asked to go there by a foreigner, I played the tape and got its meaning.”

59. What difficulty did Mr.Zhang have learning English at first?

A. He had no time to study English

B. His company didn’t allow them to study English

C. He had no courage to speak out.

D. He had no chance to speak English.

60. Which of the following is NOT the benefit Chen gets from learning English?

A. He gets some good advice on learning English from foreigners.

B. He earns more money from some regular foreign customers.

C. He has to spend both money and effort learning English.

D. He gets great fun and encouragement in learning English.

61. We can infer from the passage that _____.

A. the company is the first to encourage its drivers to learn English

B. all the drivers have made money after learning English

C. the company has developed and English tape for its drivers

D. the tape is welcomed by the drivers learning English

62. What is the probable meaning of the underlined word “facilitate” in the fifth paragraph?

A. To make easy  B. To increase     C. To encourage   D. To check