问题 选择题

对土壤的形成起主导作用的是(    )

A.气温

B.地形

C.生物

D.降水

答案

答案:C

题目分析:土壤是一种独立的自然体,它是在各种成土因素非常复杂的相互作用下形成的。对于土壤的形成来说,各种成土因素具有同等重要性和相互不可替代性。其中生物起着主导作用,特别是生物当中的植物。因为土壤中最重要的成分“腐殖质”,也可以认为是我们常说的肥力,主要来自于地上植物体。所以土壤形成过程中主导作用的因素是C生物。

点评:本题难度较小,解答本题需明确:生物,如植物、微生物和动物等能够比自然界更快的将岩石破碎成细小颗粒并进行混合,即形成土壤。

名词解释
阅读理解

阅读理解

     If you were walking around a supermarket and saw a woman with a shaved head, a ring through her

nose, a totem design on her arm and she has a small child in her shopping trolley, what would your

opinion be? Do you think this kind of body decoration is attractive or ugly? Different people have different ideas. The following are some examples of body decoration from around the world.

     In many parts of Africa, it is thought that an attractive girl should have really shinny skin. On Bali, a little island in Indonesia, they believe that a beautiful woman or a handsome man must have perfectly straight,

flat teeth. The Balinese believe that teeth with pointed edges make you look like an ugly wild animal. So

when a girl or boy becomes a teenager, he or she is taken to a special person in their village who will file

off teeth points to make them smooth and flat. There is no anesthetic and this tooth filing is really painful. It

is a kind of test. If you can stand it without screaming or crying too much, then you are thought ready to

become an adult.

     In Myanmar, there is a small group of people who are called the "Padaung". They believe that a woman can only be really beautiful if she has a long neck. I mean a VERY long neck. Now you might think that

you are either born with a long or short neck and that there's nothing whatever you can do about it. But

you would be wrong! At around the age of 5, a Padaung girl has heavy metal rings fitted around her neck,

tightly between the chin and shoulders. Each year more rings are added and very, very slowly their weight pushes the shoulders down, in this way making the neck look longer. A Padaung woman will wear her

neck rings all her life, never once taking them off.

    So now I'm sure you will all agree that different people have different ideas about what is beautiful.

1. What is mainly talked about in Paragraph 1?

A. Women's design.      

B. Beautiful body decoration.

C. Attractive decoration.  

D. Body decoration.

2. What does the underlined word "trolley" in the first paragraph mean? 

A. handbag        

B. luggage      

C. shopping cart      

D. basket

3. On Bali, it is believed that _____________.

A. a person with sharp teeth looks ugly    

B. a person with straight, flat teeth looks ugly

C. a teenager's teeth points must be filed off with anesthetic

D. no one will scream or cry when having his teeth points filed off

4. Which of the following is NOT true?

A. Most African people think that a girl with shinny skin is beautiful.

B. Many people think that woman with a ring through nose is neither attractive nor ugly.

C. It is thought that a beautiful woman should have straight, flat teeth on Bali.

D. Some people think it beautiful that a woman has a long neck in Myanmar.

5. What is the best title of the passage?  

A. Who Is a Beautiful Woman?           

B. Inner beauty

C. Different Ideas about Beautiful        

D. Body Decoration