企业网上银行集团理财的授权权限包括（）。A.查询子公司账户的余额明细 B.将子公司账

函数f（x）为奇函数，且在区间[2，5]上为减函数并有最小值为2，则函数f（x）在区间[-5，-2]上为（　　）

A．减函数且最小值为-2

B．减函数且最大值为-2

C．增函数且最小值为-2

D．增函数且最大值为-2

静定结构内力图的校核必须使用的条件是：（）

A.平衡条件

B.几何条件

C.物理条件

D.变形协调条件

治疗支原体肺炎首选的抗生素是( )

A．氨苄青霉素
B．庆大霉素
C．青霉素
D．红霉素
E．链霉素

下列哪种生命现象与激素无关[ ]

A．青春期男孩出现遗精，女孩出现月经

B．小孩能不断长高

C．人的眼睛有黄、蓝、黑之分    

D．血糖含量经常保持稳定

阅读理解。

     On a rainy day, you will see many streams of muddy (多泥的) water running down the slopes (山坡) of

a hill. The water is muddy because it washes away soil from the hill slopes.

      Sometimes soil is blown away by strong winds. When the soil is carried away by water or wind, we say

that the land is eroded (侵蚀). This is known as soil erosion.

      Plants cannot grow on eroded land. There is not enough soil on eroded land to give them the things they

need. Plants need water and salts from the soil. 

      We can do a number of things to stop soil erosion. This is called soil conservation (保护).

      One way of soil conservation on flat, open ground is to grow small plants such as grasses. Their roots

hold the soil tightly together. Another way is to plant trees around an open field. Thus soil erosion by strong

winds cannot take place. Rows of trees act as a very big wall.

      Soil erosion on slopes can be stopped by cutting "steps" called terraces (梯田). Water carrying soil cannot

run straight down the slope now. It has to run down the terraces. This slows down the flow of the water.

Most of the soil in the water is left behind on the terraces.

      There are some other ways of soil conservation.

1. On a rainy day the water running down the slopes of a hill is muddy because _____. [ ]

A. there is no terrace on the slopes

B. there is no small plant on the slopes

C. it washes away soil from the slopes

D. there is too much soil on the slopes

2. Plants cannot grow on eroded land because _____. [ ]

A. there is a lot of sand

B. there is not enough water and salts

C. there is no water

D. the land is too hard

3. One way of soil conservation on flat, open ground is _____. [ ]

A. to grow small plants such as grasses

B. to plant trees around an open field

C. to add fertilizer to the soil

D. A and B

4. From the passage we learn that there are _____ ways to reserve soil.[ ]

A. only three

B. two

C. more than three

D. six