问题 选择题

下列物质可直接反应生成盐的是(  )

①金属   ②碱性氧化物   ③碱   ④非金属   ⑤酸性氧化物   ⑥酸.

A.只有①②③

B.只有①④⑥

C.只有②⑤⑥

D.全部

答案

①金属的通性:可以和酸反应生成对应的盐和氢气,故①正确;

②碱性氧化物是能和酸反应生成水的氧化物,故②正确;

③碱可以和酸发生中和反应生成盐和水,故③正确;

④非金属元素的单质硅可以和强碱氢氧化钠反应生成硅酸钠和氢气,故④正确;

⑤酸性氧化物是能和碱反应生成盐和水的化合物,故⑤正确;

⑥酸可以和碱发生中和反应生成盐和水,故⑥正确.

故选D.

阅读理解

As a professor at a large American university,there is a phrase that I hear often from students:“I’m only a 1050.”The unlucky students are speaking of the score on the Scholastic Aptitude Test(SAT),which is used to determine whether they will be admitted to the college or university of their choice,or even if they have a chance to get a higher education at all.The SAT score,whether it is 800,1100 or 1550,has become the focus at this time of their life.

It is obvious that if students value highly their test scores,then a great amount of their self-respect is put in the number.Students who perform poorly on the exam are left feeling that it is all over.The low test score,they think,will make it impossible for them to get into a good college.And without a degree from a prestigious university,they fear that many of life’s doors will remain forever closed.

According to a study done in the 1990s,the SAT is only a reliable indicator of a student’s future performance in most cases.Interestingly,it becomes much more accurate when it is set together with other indicators-like a student’s high school grades.Even if standardized tests like the SAT could show a student’s academic proficiency(学业水平),they will never be able to test things like confidence,efforts and willpower,and are unable to give us the full picture of a student’s potentialities(潜力).This is not to suggest that we should stop using SAT scores in our college admission process.The SAT is an excellent test in many ways,and the score is still a useful means of testing students.However,it should be only one of many methods used.

小题1:The purpose of the SAT is to test students’______.

A.strong will

B.academic ability

C.full potentialities

D.confidence in school work小题2:Students’ self-respect is influenced by their______.

A.scores in the SAT

B.achievements in mathematics

C.job opportunities

D.money spent on education小题3:“A prestigious university” is most probably______.

A.a famous university

B.a technical university

C.a traditional university

D.an expensive university小题4:This passage is mainly about______.

A.how to prepare for the SAT

B.stress caused by the SAT

C.American higher education

D.the SAT and its effects

判断题