问题 选择题

一般来说,生态系统中生物的种类和数量越多,食物链和食物网越复杂,生态系统的调节能力就越强。以下为某科研人员对4个生态系统中生物种类和数量的调查统计结果,调节能力最强的生态系统是[ ]

A.物种1:0 物种2:90 物种3:0 物种4:0 物种5:30  物种6:30  物种7:0  物种8:0  物种9:40

B.物种1:200 物种2:350 物种3:0 物种4:0 物种5:30 物种6:0  物种7:0  物种8:0  物种9:40

C.物种1:150  物种2:250 物种3:100  物种4:800  物种5:40  物种6:30  物种7:50  物种8:20  物种9:1

D.物种1:300 物种2:200  物种3:0  物种4:0  物种5:0 物种6:0 物种7:0  物种8:50  物种9:50

答案

答案:C

单项选择题 A1型题
阅读理解

阅读理解

     I came to live here where I am now between Wounded Knee Greek and Grass Greek. Others.

came too,and we made these little grey houses of logs that you see, and they are square. It is a bad

way to live , for there can be no power in a square.

      You have noticed that everything an Indian does is in a circle. and that is because the Power of the

World always works in circles. and everything tries to be round. In the old days when we were a strong

and happy people, all our power came to us from the respectful circle of the nation, and so long as the

circle was unbroken,the people were getting rich. The flowering tree was the living center of the circle,

and the circle of the four quarters nursed it. The east gave peace and light, the south gave warmth. the

west gave rain,and the north with its cold and strong wind gave strength and continuous power. This

knowledge came to us from the outer world with our brief. Everything the Power of the World does is

done in a circle. The sky is round , and I have heard that the earth is round like a ball ,and so are all the

stars. Birds make their nests in circles .for theirs are the same as ours. The sun comes forth and goes

down again in a circle. The moon does the same , and both are round. Even the seasons form a great

circle in their changing, and always come back again to where they were. The life of a man is a circle

from childhood to childhood, and so it is in everything where power moves. Our places were like the

nests of birds , and these were always set in a circle , the nation's circle , a nest of many nests.where

the Great Spirit meant for us to nurse our children.

      But the Wasichus ( Indian word for " white people" )  have put us in these square boxes. Our

power is gone and we are dying , for the power is not in us any more. You can look at our boys and

see how it is with us. Where we were living by the power of the circle in the way we should, boys

were men at twelve or thirteen years of age. But now it takes them very much longer to be bull-grown.

1 . According to the  passage , the  Indians ____________ . 

A. don't have modern instruments in their homes

B. refused to take themselves away from round places

C. lived in round places, but then decided to move into square houses

D. lived in round places , but were forced to live in square houses

2. TWO things being compared in the passage are___________.    

A. the Indians' today's and tomorrow's living beliefs

B. the Indians' past and present living conditions

C. the Indians' old and new power

D. man's power versus natural power

3. In the second paragraph "the four quarters" refers to_________. 

A. the four directions

B. the four rooms of the Indian's house

C. the four seasons

D. the four kinds of natural power

4. According to the author, once the Indians moved into square houses,_______________.

A. they had to move to other houses

B. they forgot the old way of life

C. boys took more time to grow into men

D. everyone was not happy