问题 填空题

生活中处处有化学.你知道下列化学原理吗?

(1)陈醋和酱油颜色相似,可以利用它们的______(填具体的物质的性质)不同将其区别开;

(2)要证明自来水是否是硬水,可以使用______(填物质的名称)来检验;

(3)使用久了的水壶内壁会形成水垢,可以用______(填物质的名称)浸泡除去.

答案

(1)陈醋具有刺激性气味,而酱油没有刺激性气味,可以根据味道进行区分.

(2)硬水和软水可用肥皂水鉴别,产生泡沫较多的是软水,较少的是硬水.

(3)食醋中含有醋酸,水垢的主要成分是碳酸钙,醋酸与碳酸钙反应能生成可溶的醋酸钙、水、二氧化碳,所以可用食醋除去水垢.

故答案为:

(1)气味;

(2)肥皂水;

(3)食醋.

阅读理解

By the time a student starts to apply (申请) for a US university, much of his or her record, including grades and after-school activities, has been set in stone. For this reason, the student must in his or her first year of high school start getting ready for college. He or she also has to decide on the non-academic (非学业的) tasks, which are important to improve the student’s chances of getting in.

1. After-school activities

When it comes to high school activities, quality is better than quantity (数量). Admissions (录取) officers do not want to see a student who has joined dozens of organizations (组织) for a short period of time.

Many students try to do this towards the end of their high school. But schools want to see a student who has been with one organization for all or most of high school. A student who can do this shows maturity (成熟). It is the quality that admissions officers look for as it is one of the markers of future success.

2. Leadership

Schools want to see a student who has taken on a leadership role in an organization. A student can show leadership by taking on any role that needs extra commitment (奉献) and responsibility.

If you do not have a great title (头衔) such as president, be sure to explain any leadership roles you have taken. This kind of involvement (参与) in school activities shows you are the responsible person that admissions officers look for.

3. Consistency (一致性)

Admissions officers like an application (申请) to be consistent. For example if there is a high school activity you particularly (特别地) love, it would help if that activity matches your future academic and career interest.

Of course not everything needs to be consistent. Otherwise (否则) the student would be narrow and this is not what schools are looking for. However, you cannot have different parts of your application saying conflicting (矛盾的) things.

小题1:Who was the article written for?

A.US college students hoping to study in China.

B.Chinese college students hoping to study in the US.

C.Third year high school students hoping to study in the US.

D.Teenagers hoping to study in the US.小题2:The underlined phrase "set in stone" in Paragraph 1 probably means ______.

A.made clear

B.something unchangeable

C.become obvious

D.at the right level(水平)小题3:The author’s suggestion is to ______.

A.try as many different organizations as possible

B.start planning for college at the beginning of high school

C.make everything in an application consistent

D.put non-academic tasks before academic tasks小题4:According to the article, which of the following statements is TRUE?

A.Students should choose after-school activities they have great interest in.

B.It’s already too late for first year students to apply for a US university.

C.It is necessary for a student to be a president if he/she is to apply for a US university.

D.Students should concentrate on just one activity in high school.

填空题