问题 选择题

无机化学可根据其组成和性质进行分类,如图所示的分类方法的名称是(  )

A.交叉图

B.树状图

C.柱状图

D.单一分类法

答案

A、交叉法就是按照不同的标准进行分类,把物质分成若干类的方法,如碳酸钠既是碳酸盐又是钠盐,故A不选;

B、树状分类法是一种很形象的分类法,按照层次,一层一层来分,就像一棵大树,有叶、枝、杆、根,图示方法就是树状图,故B选;

C、柱状图是以条形柱状的形式展示物质的分类,故C不选;

D、单一分类法是以一个标准将物质进行分类,故D不选.

故选B.

阅读理解

第三部分:阅读理解(共13小题;每小题2分,满分26分)

请认真阅读下列短文,从短文后各题所给的A、B、C、D四个选项中,选出最佳选项,并在答题纸上将该项涂黑。

A

America is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while — then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can be quite difficult for us Chinese to understand, because friendships between us flower more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.

Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.

Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don’t show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may be generous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. The Americans, however, express their welcome usually at homes, but truly can not manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves treated hospitably.

For the Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!

56. The writer of this passage must be ______.

A. an American      B. a Chinese     C. a professor       D. a student

57. Which of the following statements is TRUE according to the passage?

A. Friendships between Americans usually extend deeply into their families.

B. Friendships between Americans usually last for all their lives.

C. Americans always show their warmth even if they are very busy.

D. Americans will continue their friendships again even after a long break.

58. From the last two paragraphs we can learn that when we arrive in America to visit an American friend, we will probably be ______.

A. warmly welcomed at the airport      B. offered a ride to his home

C. treated hospitably at his home       D. treated to dinner in a restaurant

59. The underlined words  “generous with our time” in Paragraph 3 probably mean ______.

A. strict with time    B. serious with time   C. careful with time   D. willing to spend time

60. A suitable title for this passage would probably be “______”.

A. Friendships between Chinese      B. Friendships between Americans

C. Americans’ hospitality           D. Americans’ and Chinese’s views of friendships

单项选择题