在某水体中,如果除了鲈鱼以外没有其它鱼类,那么鲈鱼的成鱼就会以本种的幼鱼为食。蝌蚪能

题型:单项选择题

问题:

在某水体中,如果除了鲈鱼以外没有其它鱼类,那么鲈鱼的成鱼就会以本种的幼鱼为食。蝌蚪能从肠道中排出有毒物质,在蝌蚪密度大的池塘中,该物质多了就会使本种的幼小蝌蚪的死亡率增加。上述两种现象分别属于()

A.捕食、种内斗争

B.捕食、竞争

C.种内斗争、竞争

D.种内斗争、种内斗争

考点:高中生物种群和群落种群和群落题库
题型:单项选择题

阅读理解    

        These days computer games have become more and more popular in

many cities and towns. A lot of small shops along busy streets have changed

into computer game houses in order to get more money. These places are

always crowded with people.      

         In the computer game houses, people spend a lot of money matching

on the machines. It's hard for one to beat a computer,but one can get ahead

after trying again and again. People want to win when they play computer

games. The more they lose, the more they want to win, and at last they

even cannot live without it.   

        The result is that some people don't want to work and take days off.

They play in computer game houses for hours and hours. For school boys,

things are even worse. They have no mind for their lessons. When school

is over,they rush to the computer game houses near their schools. Some

of them can get enough money from their parents. Some of them are not

lucky enough to get money. They begin to steal others' money and become

 bad.    

        Computer games addiction is a serious problem in our life.

Something has to be done to stop it.

1.Today there are many _______ instead of small shops along the streets.    

A. big supermarket   

B. computer game houses   

C. popular theaters     

D. modern buildings

2.People spend much money matching on the computers because               .    

A. it is not easy for people to beat the computers   

B. they haven't got anything else to do every day   

C. the computer game houses are always crowded with people  

 D. they want to get money from matching on the machines

3.Some people don't want to work because                  .  

A. they cannot get money from it     

B. playing computer games is better than working   

C.They have been in the habit of playing computer games   

D. playing computer games is more popular

4.As a student, playing computer games                   

A. will make him become bad    

B. can make him clever     

C. will have no mind for his lessons    

D. both A and C

5.Which of the following is NOT false?    

A. All the students can get more money from their parents if they play computer games.  

B. People will have good jobs if they are good at playing computer games.    

C. It is important to do something to stop people from playing computer games. 

D. Many people, old and young, can make money from playing computer games.

题型:单项选择题

当m=______时,函数y=(m-2)xm2-3+3是一次函数.

题型:单项选择题

小儿上呼吸系统的解剖特点?

题型:单项选择题

将下列句子译成英语。

1. 这个小女孩梦想将来成为流行歌星。(dream of/about)

    _________________________________________________

2. 说服他放弃这个计划很难。(give up) 

    _________________________________________________

3. 最后我决定不听从他的劝告。(make up one's mind) 

    _________________________________________________

4. 开始,学生们不习惯时间表的变化。(be used to)

    _________________________________________________

5. 在业余时间,我喜欢集邮和钓鱼。(be fond of) 

    _________________________________________________

题型:单项选择题

企业应当在符合重要性和成本效益原则的前提下,保证会计信息的完整性,其中包括编报的报表及其附注内容等应当保持完整,不能随意遗漏或者减少应予披露的信息,( )都应当充分披露。

A.与使用者决策相关的有用信息

B.会计人员所掌握的信息

C.经营管理信息

D.企业核心技术信息

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