问题 选择题

NA表示阿伏加德罗常数的值,下列说法正确的是(  )

A.100mL2mol•L-1碳酸钠溶液中,CO32-离子数为0.2NA

B.将10mL1mol•L-1FeCl3溶液滴入沸水中,所得氢氧化铁胶粒数为0.01NA

C.1molNa2O2固体中含离子总数为3NA

D.电解精炼铜时,外电路中转移电子数为2NA个时,阳极铜质量减少64g

答案

A、由于碳酸根离子发生了水解,数量减少,离子数小于0.2NA,故A错误;

B、氢氧化铁胶体的胶粒是氢氧化铁的集合体,胶粒数小于0.01NA,故B错误;

C、由于1mol过氧化钠中含有2mol钠离子、1mol过氧根离子,含离子总数为3NA,故C正确;

D、电解时阳极氧化、阴极还原,应该是阴极析出铜,故D错误;

故选C.

选择题
阅读理解

The English test will be removed from China’s college entrance exam by 2020, according to details of exam and admis­sion reform revealed by the Ministry of Education. The national college entrance exam, known as the “Gaokao” has been used to evaluate Chinese students for three decades. The Ministry of Education has worked out a plan for reforming exams and enrollment. The Ministry will solicit(征求) public opinions before its release. Instead, tests will be held several times a year to allow students to choose when and how often they sit the exam so as to alleviate study pressure and change China’s once-in-a-lifetime exam system.

The plan and suggestions for its implementation will be announced in the first half of next year. It will be piloted in se­lected provinces and cities and promoted nationwide from 2017. A new exam and admission system will be established by 2020, according to the education ministry.

The decision has aroused a heated discussion among Shanghai educators and parents who doubted the reform would re­duce the burden of learning English or if the substitute test could reflect a student’s English skills and help students learn English better.

“The reform shows China is learning from the West to give students more test-taking chances. But more chances might become more of a burden since Chinese students are likely to repeat the test until they get the highest score,” said Cai Jigang, a professor at Fudan University’s College of Foreign Languages and Literature and chairman of the Shanghai Advisory Committee for College English Teaching at Tertiary Level.

Yu Lizhong, chancellor of New York University Shanghai, where classes are in English and students are required to have a high standard of English, said the most important aspect of the reform lay in what to test and how to test.

“ As far as I see, the reform doesn’t mean English is no longer important for Chinese students after it will be excluded from the unified college entrance exam,” Yu said. “In a way, English is even more important than before since the test would only serve as reference, while every college and university, even every major, can have different requirements of a student’s English skills under a diverse evaluation system. ”

Yu said some students will have their study pressure reduced if the major they choose doesn’t need excellent English while others still need to study hard if they want to be among the best students.

The education ministry said the reform would not affect students attending the college entrance exam over the next three years.

小题1:What can we learn from the first paragraph?

A.English will become less and less important in the stage of compulsory education.

B.It has been 30 years since English became one subject of national college entrance exam.

C.China’s once-in-a-lifetime exam system is unacceptable at all.

D.The system that tests are held several times does more good than once-in-a-lifetime exam system.小题2:According to the passage, Shanghai educators and parents argue that _____.

A.the new exam and admission system will make no difference

B.English shouldn’t be removed from China’s college entrance exam

C.the reform may accomplish the very opposite

D.Western educational system does not apply to China小题3:What does the passage try to express in the underlined sentence?

A.Students needn’t lay a good foundation during the period of high school.

B.Whether students should study hard English may depend on their major.

C.Students can constantly strive for perfection only in their major.

D.English must be close to full mark.小题4:What’s the purpose of the passage?

A.To advise students not to devote themselves to English.

B.To call on Education Department to remove English from “Gaokao”.

C.To support the act of Ministry of Education.

D.To encourage students to do as they have planned.