关于未分化癌，错误的说法是（） A.分化程度极差 B.细胞体积较小，核较小，而胞质较

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

集体奖励的条件包括( )。

A．依法查处违法犯罪活动，维护社会稳定，成绩突出的

B．依法妥善处置群体性事件，积极参加抢险救灾，圆满完成重大活动安全保卫任务，成绩突出的

C．加强公安基层基础建设，落实各项管理防范措施，有效预防和制止违法犯罪活动，成绩突出的

D．加强思想政治工作，强化教育、管理和监督，提高队伍的整体素质和战斗力，成绩突出的

下列实验操作中错误的是(   ) 

A．分液时，分液漏斗下层液体从下口放出，上层液体从上口倒出

B．蒸馏时，应使温度计水银球靠近蒸馏烧瓶支管口

C．蒸发结晶时应将溶液蒸干

D．称量时，称量物放在称量纸上，置于天平左盘，砝码放在天平右盘中

半数有效量(ED₅₀)是

A．引起50%动物死亡的剂量

B．引起50%动物中毒的剂量

C．引起50%动物产生阳性反应的剂量

D．和50%受体结合的剂量

E．达到50%有效血药浓度的剂量

什么关节是白日全身运动最频繁的关节（）。

A、膝关节

B、肩关节

C、腕关节

D、口腔颞下颌关节