问题 选择题

有“地球之肾”之称的生态系统是( )

A.森林生态系统

B.湿地生态系统

C.草原生态系统

D.农田生态系统

答案

答案:B

题目分析:湿地生态系统是在多水和过湿条件下形成的生态系统,沼泽是典型的湿地生态系统,以沼泽植物占优势,动物的种类也很多,湿地具有净化水源、蓄洪抗旱的作用,它兼有水域和陆地生态系统的特点,具有极其特殊的生态功能,是地球上最重要的生命支持系统,湿地在抵御洪水、调节径流、控制污染、调节气候、美化环境等方面起到重要作用,它既是陆地上的天然蓄水库,又是众多野生动植物资源,特别是珍稀水禽的繁殖和越冬地,它可以给人类提供水和食物,湿地与人类息息相关,是人类拥有的宝贵资源,因此湿地被称为 “地球之肾”,故选B。

阅读理解

“Old wives tales” are beliefs passed down from one generation to another, For example, most of us remember our patents’ telling us to eat more of certain foods or not to do certain things. Is there any truth in these teachings? Some of them agree with present medical thinking, but others have not passed the test of time

Did your mother ever tell you to eat your carrots because they are good for your eyes? Scientists now report that eating carrots can help prevent a serious eye disease called macular degeneration Eating just one carrot a day can reduce the possibility of getting this disease by 40%. Garlic(蒜)is good for you, too。It can kill the type of virus that causes colds.

Unfortunately, not all of Mom’s advice passed the test of medical studies. For example, generations of children have been told not to go swimming within an hour after eating. But research suggests that there is no danger in doing so. Do sweets cause tooth problems? Well, yes and no. sticky sweets made with grains tend to cause more problems than sweets made with simple sugars. 

Even though science can tell us that some of our traditional beliefs don’t hold water, there is still a lot of truth in the old wives’ tales, After all, much of this knowledge has been accumulated (积累) from thousands of our traditional beliefs don’t hold water should respect this body of knowledge even as research for clear scientific support to proven it true or false

小题1:Which of the following is TRUE according to the text?          

A.Eating garlic is good for our eyes

B.Sticky sweets are damaging to our teeth

C.Swimming after a meal is dangerous。

D.Carrots prevent people from catching colds小题2:The author develops the third paragraph mainly____。          

A.by cause and effects

B.by order in space

C.by order in time

D.by examples小题3:The phrase “hold water” in the last paragraph most probably means“____ ”

A.to be believable

B.to be valuable

C.to be admirable

D.to be smtable小题4:What is the author’s attitude toward “old wives’ tales” in the text?

A.So objective

B.Objective

C.Dissatisfied

D.Curious

判断题