关于血浆蛋白以下说法错误的是 （） A.血浆中主要的含铁蛋白是转铁蛋白 B.铜蓝蛋

阅读理解。

     You may have noticed that the world's population is not evenly distributed (分别) around our planet.

There are some countries where people seem to be living nearly on top of each other because conditions

are overcrowded. Then there are others where it seems that hardly anybody lives. What influences this

unequal distribution of people? There are specific advantages and disadvantages of diving in a certain

area.

     The two main factors that influence people'choice of location are climate and resources. Climate is the

usual weather conditions in a region. Areas that have bad weather are generally less deal as places to live

in. The north and south poles at the top and bottom of the world may be beautiful in their rugged, natural

way, but the disadvantage of the bitterly cold and windy conditions usually keeps people way.  When it

comes to climate, warm conditions and a normal amount of rainfall are advantage that attract people.

     Natural resources are things that we get from nature that help us survive. Each region offers different

resources, and therefore attracts different groups of people. People who enjoy the beach car make their

living by catching and selling the ocean's many fish and other sea creatures. Those who prefer farming can

take advantage of rich soil (土壤) in valleys near rivers. Some people are willing to accept the

disadvantages of the terrible conditions of deserts or mountains in order to take advantage of the

resources like oil or woods.

1. The underlined part "on top of "in the first paragraph most likely means_______.

A. very close to    

B. on the highest part of

C. in control of    

D. on the surface of

2. What are the main factors that influence the distribution of people?

A. Resources and oceans.  

B. Climate and rivers.

C. Climate and resources.  

D. Warm conditions and rainfall.

3.The writer thinks many people don?t live near the north or south pole because ________.

A. they can?t get enough food there

B. they natural sights there don?t attract people

C. the unpleasant weather keeps them away

D. the length of nighttime is too short or too long

4. Why do people go and live in valleys near rivers?

A. The temperature isn?t too low in winter.

B. the resources like oil can bring them much money.

C. People can make their living by catching and selling fish.

D. It?s easier for people to grow plants or keep animals.

5. The purpose of the example in the last paragraph is to tell us _______.

A. people cannot survive in cold conditions

B. different resource attract different groups of people

C. People usually prefer living at the seaside to living in mountains

D. a normal amount of rainfall is necessary for people to live in the desert

属于毒理学上限指标的是（）。

A.ADI

B.LD50

C.NOAEL

D.LOAEL

E.MAC

腰麻引起的休克属于()

A．低血容量性休克

B．神经源性休克

C．心源性休克

D．过敏性休克

E．创伤性休克

阅读下面的程序段：
public class Sun

public static void main(String args[ ])

int a=0
for(int i=1;i＜=3;i++)

for(int j=1;j＜-i;j++)

for(int k=j;k＜=3;k++)

a=a+1;



System.out.println(

A．我;


执行上面的3重循环后，a的值为( )。A) 3

B．9

C．14

D．21

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