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Biodiversity(生物多樣性), or biological diversity, is a wide-ranging concept that covers all the different kinds of plant and animal species present on earth. Environmentalists believe that many millions of species exist. As all these living organisms are dependent on each other in some way, biodiversity is desirable. Any loss to the planet is actually a loss for mankind as well, and it is our responsibility to try and save Earth’s biodiversity.
Biodiversity has a vital role to play in the evolution（演變）of species. Species become extinct, but new species evolve, and this is how a balance is maintained. This may sound pretty simple, but it takes millions of years for changes to take place.
Biodiversity is also very important to the stability of food webs. Damage to them can mean disaster for an entire ecosystem. The extinction of a single animal species can put huge pressure on the numerous other species dependent on it.
Biodiversity also has an important role to play in human society. Apart from being the most intelligent species on earth, human beings are also the most dependent. We depend on nature to meet our basic needs. When we change the balance of nature to create our cities and bring about our technical advances, we knowing or unknowing cause great damage to the ecosystem. This must be understood, and the damages must be reversed（顛倒）in any way they can to ensure that the balance of the ecosystem is maintained.
小題1:We learn from the first paragraph that_________.
A biodiversity can be seen
B all living species are found on earth.
C people everywhere are aware of the importance of biodiversity
D the loss of any species can affect humans
小題2:Why can change in food webs lead to disaster?
A Because it can make people suffer from disease
B Because it can put huge pressure on some species
C Because it takes a long time for such changes to take place
D Because it will damage ninety-nine percent of species
小題3:What does the underlined word probably mean?
A 畫(huà)線 B Peace C Strength D Variety
小題4:We learn from the last paragraph that __________.
A humans are as independent as they are intelligent
B the balance of the ecosystem is easily maintained
C nature has given us a lot
D nature is taking revenge on us
小題5:Which of the following may be the best title for this passage?
A Food Webs are Closely Related to Biodiversity.
B Biodiversity Plays a Very Important Role in Evolution
C How Biodiversity Affects Human Society.
D Understanding Biodiversity and Its Importance.

小題1:D
小題2:B
小題3:A
小題4:C
小題5:D

1.問(wèn)題：從第一段中我們可以知道什么，答案：D任何物種的消失都會(huì)影響人類(lèi)。從最后一句生物物種的的缺失也是人類(lèi)的損失努力保護(hù)和拯救地球物種的多樣性是我們的責(zé)任。2.問(wèn)題：為什么改變食物鏈會(huì)導(dǎo)致災(zāi)難？答案：B。它會(huì)給某一物種帶來(lái)巨大壓力。3.問(wèn)題：畫(huà)線部分的單詞意思可能是：不變。4.問(wèn)題：最后一段我們可以知道答案C。從第一句中心句生物多樣性對(duì)我們?nèi)祟?lèi)社會(huì)也起著重要的作用。5.下列哪項(xiàng)是最好的標(biāo)題？理解生物多樣性及其它的重要性。

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根據(jù)短文內(nèi)容,選擇正確答案.
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