问题 问答题 简答题

请描述生态平衡失调的基本标志。

答案

参考答案:

(1)平衡失调的结构标志:生态系统的结构可以从另外一种角度划分为两级结构水平:一级结构水平是指生态系统四个基本成分的生物成分,即生产者、消费者和分散者;二级结构水平是指组成一级结构的划分及其特征。如生物的种类组成、种群和群落层次及其变化特征等。

(2)生态平衡失调的功能标志:生态系统平衡失调在功能上的反映就是能量流动在系统内的某一个营养层次上受阻或物质循环正常途径的中断。

完形填空
Two years ago ,Shirley, wife, mother and doctor, found herself worn out. She got up earlier, and went to bed later, just to meet everyday 36 _____ , but lacked 37 _____ for the things that mattered most She and her husband, a lawyer, began searching for ways to 38 _____ their lives. We had to decide what was really 39 _____” says Shirley. They knew they wanted more time to 40 _____ with their three- year -old son, to exercise and eat right, and to develop friendship.
So the couple chose to live more simply,shopping with care for necessities and enjoying inexpensive 41 _____ such as reading, cooking and going to the park.
Then Shirley 42 _____ her job and began working part time. She printed business cards that 43 _____
“At your service, buy 44 _____ a little time” and helped clients (客户)with personal tasks like shopping, paying bills and 45 parties. “I still work hard, but being able to control my hours makes a 46 _____,” she says,“ I can spare time to take my son to the 47 _____ or play basketball with him. My stress and headaches are 48  _____ ’’
Shirley and her husband are 49 _____ alone in wanting to 50 _____ and live a satisfying Life. A survey found that 54 percent of parents say they have little time with their children, and 47 percent of married couples 51  _____that they lack time together. 52  _____does the time go?
For most people, 53 _____ and commuting (通勤)take up most of the day. Simplifying means becoming 54 _____ of the ways we use money, time and energy, and finding ways to make things easier. Then we have to gain 55 _____ over Life and have time for the pleasures.
小题1:
A.activitiesB.servicesC.demandsD.exercises
小题2:A. time    B. strength C. money    D, ability
小题3:
A.leadB.simplifyC.adaptD.consider
小题4:A_ comfortable B. interesting  C. important    D. hard
小题5:
A.studyB.helpC.meetD.play
小题6:
A.pleasuresB.placesC.tasksD.goods
小题7:
A.foundB.receivedC.tookD.quit
小题8:
A.readB.wroteC.showedD.told
小题9:A_ us  B. yourself C. children D  herself
小题10:A. attending  B. organizing   C. having   D going
小题11:
A.lifeB.resultC.balanceD.difference
小题12:
A.officeB.hospitalC.parkD.school
小题13:
A.goneB.betterC.strongD.obvious
小题14:
A.a bitB.far fromC.much tooD.more than
小题15:
A.keep paceB.settle downC.take offD.slow down
小题16:A. expect B. doubt    C. complain D, imagine
小题17:
A.HowB.WhenC.WhereD.Why
小题18:A. traveling  B. reading  C. shopping D, working
小题19:
A.awareB.afraidC.proudD.sure
小题20:
A.valueB.controlC.successD.experience
判断题