问题 单项选择题

下列关于生态系统信息传递特征的描述,正确的是()

A.生态系统的物理信息都来源于环境

B.植物都通过化学物质传递信息

C.信息沿食物链从低营养级向高营养级传递

D.信息可以调节生物种间关系

答案

参考答案:D

解析:

物理信息既能来源于无机环境,也能来自生物,A错误;植物也可以通过物理信息如颜色等传递信息,B错误;信息既能在同种生物之间进行传递,也可在不同生物之间传递,甚至可在生物和无机环境之间传递,C错误;捕食与捕食者之间的信息传递可以调节生物种间关系,D正确。

考点:本题考查生态系统信息及信息传递特征的知识。意在考查能理解所学知识的要点,把握知识间的内在联系的能力。

单项选择题
完形填空
One effective way of destroying happiness is to look at something and focus on even the smallest fault. It's like looking at the tiled(铺瓦的) ceiling and concentrating on the space where one tile is 小题1: .
Once I heard a bald(秃头的) man said. “Whenever I enter a room,  小题2:  I see is hair." Once you've   小题3: what your missing tile is, explore whether getting it will   小题4:  make you happy. Then do one of the three things: get it, replace it with a different  小题5:  , or forget about it and  小题6:  the tiles in your life that are not missing.
We all know people who have had a relatively  小题7:  life, yet are often unhappy while people who have suffered a great deal but  小题8:  remain happy.
The first  小题9:  is gratitude. All happy people are  小题10: . Ungrateful people cannot be happy. We tend to think that being unhappy leads people to  小题11:  , but it's truer to say that complaining leads to people becoming unhappy.
The second secret, is 小题12: that happiness is a byproduct(副产品) of something else. The most obvious 小题13: are those pursuits(追求) that give our lives purpose—anything 小题14: studying insects to playing baseball. The more passions we have, the more happiness we are  小题15: to experience.
Finally, the belief that something permanent goes beyond us and that our  小题16:  has some larger meaning can help us to feel happier. We   小题17: a spiritual faith, or a philosophy of life. Whatever your philosophy, it should 小题18:  this truth: if you choose to find the 小题19: in every situation, you will be blessed, and if you choose to find the awful, you will be cursed. As with happiness itself, this is  小题20:   your decision to make.
小题21:
A.differentB.missingC.shortD.broken
小题22:
A.nothingB.noneC.allD.anything
小题23:
A.determinedB.predictedC.assumedD.imagined
小题24:
A.completelyB.naturallyC.hopefullyD.really
小题25:
A.tileB.brickC.ceilingD.house
小题26:
A.look onB.focus onC.count onD.decide on
小题27:
A.peacefulB.difficultC.easyD.ordinary
小题28:
A.certainlyB.merelyC.hardlyD.generally
小题29:
A.secretB.factorC.ruleD.key
小题30:
A.wealthyB.gratefulC.proudD.generous
小题31:
A.upsetB.quarrelC.complainD.depress
小题32:
A.admittedB.assumingC.provingD.realizing
小题33:
A.sourcesB.resultsC.answersD.goals
小题34:
A.amongB.fromC.throughD.for
小题35:
A.probableB.possibleC.likelyD.capable
小题36:
A.valueB.destinationC.survivalD.existence
小题37:
A.needB.lackC.demandD.expect
小题38:
A.involveB.includeC.absorbD.mean
小题39:
A.worstB.bestC.positiveD.negative
小题40:
A.absolutelyB.totallyC.exactlyD.Largely