For the first time, researchers have discovered that some plants can kill insects in order to get additional nutrients. New research shows that they catch and kill small insects with their own sticky hairs near the roots and then absorb nutrients through their roots when the insects are killed and fall to the ground.

Professor Mark Chase, of Kew and Queen Mary, University of London, said: “The cultivated (改良的) tomatoes and potatoes still have the hairs. Tomatoes in particular are covered with these sticky hairs. They do trap small insects on a regular basis. They do kill insects.”

The number of these carnivorous plants is thought to have came up to 50 percent and many of them have until now been wrongly regarded as among the most harmless plants. Among them are species of petunia(矮牽牛), some special tobacco plants and cabbages, some varieties of potatoes and tomatoes, etc. Researchers at Royal Botanical Gardens Kew, which carried out the study, now believe there are hundreds more killer plants than previously realized.

It is thought that the technique was developed in the wild to get necessary nutrients in poor quality soil ­ and even various plants grown in your vegetable garden still have the ability.

The researchers, publishing their finding in the Botanical Journal of the Linnean Society, said: “We may be surrounded by many more murderous plants than we think.” “We are accustomed to thinking of plants as being immobile and harmless, and there is something deeply frightening about the thought of meat­eating plants，” they added.

1.Tomatoes and potatoes kill insects to ________.

A．get more sticky hairs

B．make themselves grow better

C．make their roots stronger

D．a(chǎn)void falling down to the ground

2.The word “carnivorous” in Paragraph 3 most probably means ________.

A．fast­growing B．harmless

C．insect­killing D．nutritious

3.The insect­killing technique of vegetables is developed most probably through ________.

A．evolution of species

B．helps from other garden plants

C．a(chǎn)rtificial cultivation

D．nutrients preserved in rich soil

4.The text is probably taken from ________.

A．a(chǎn) student book B．a(chǎn) science fiction

C．a(chǎn) scientific repot D．a(chǎn) bulletin board

 

1.B

2.C

3.A

4.C

【解析】

文章大意：最新研究發(fā)現(xiàn)：為了獲得營養(yǎng)，很多植物都是昆蟲殺手。

1.B　細(xì)節(jié)理解題。由第一段第一句話“...some plants can kill insects in order to get additional nutrients.”可知，這些植物殺手殺死昆蟲的目的是獲得營養(yǎng)，當(dāng)然是為了讓它們自己長得更好。

2.2】C　猜測詞義題。由劃線詞前面的these可知，此處指的是前面提到的“殺死昆蟲”的植物。

3.3】A　細(xì)節(jié)理解題。由第四段“It is thought that the technique was developed in the wild to get necessary nutrients in poor quality soil”可知，植物的這種技能是長期物種進(jìn)化的結(jié)果

4.4】C　推理判斷題。由文章第一段“For the first time, researchers have discovered that...”和最后一段“The researchers, publishing their finding in the Botanical Journal of the Linnean Society...”可推知，本文是一篇科學(xué)研究報告。

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