2.Some plants get so hungry that they eat flies,spiders,and even small frogs.What's more amazing is that these plants occur naturally (in special environments) in every state.In fact,they're found on every continent except Antarctica.
You've probably seen a Venus'flytrap.It's often sold in museum gift stores,department stores,and even supermarkets.A small plant,it grows 6to 8inches tall in a container.At the end of its stalks (莖) are specially modified leaves that act like traps.Inside each trap is a lining of tiny trigger (觸發(fā)) hairs.When an insect lands on them,the trap suddenly shuts.Over the course of a week or so,the plant feeds on its catch.
The Venus'flytrap is just one of more than 500species of meat-eating plants,says Barry Meyers-Rice,the editor of the International Carnivorous ( 食肉的 ) Plant Society's Newsletter.Note:Despite any science-fiction stories you might have read,no meat-eating plant does any danger to humans.
Dr.Meyers-Rice says a plant is meat-eating,only if it does all four of the following:"attract,kill,digest,and absorb"some form of insects,including flies,butterflies,and moths.Meat-eating plants look and act like other green plants---well,most of the time.
All green plants make sugar through a process called photosynthesis (光合作用).Plants use the sugar to make food.What makes"meat-eating"plants different is their bug-catching leaves.They need insects for one reason:nitrogen (氮).Nitrogen is a nutrient that they can't obtain any other way.While almost all green plants on our planet get nitrogen from the soil,"meat-eating"plants can't.They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity.So they've come to rely on getting nitrogen from insects and small animals.In fact,nutrient-rich soil is poisonous to"meat-eating"plants.Never fertilize them!But don't worry,either,if they never seem to catch any insects.They can survive,but they'll grow very slowly.
66.According to the passage,carnivorous plantsD.
A.only grow in wild field
B.a(chǎn)re rare to see
C.a(chǎn)re as common as flies
D.cannot grow on Antarctica
67.Venus'flytrap preys on insects byC.
A.its numerous long and thin stalks
B.a(chǎn) container where it grows
C.its insect-catching leaves
D.the lining of tiny trigger hairs
68.We can conclude from the third paragraph thatD.
A.carnivorous plants are dangerous
B.carnivorous plants are fictional
C.carnivorous plants occasionally eat books
D.carnivorous plants are harmless to humans
69.In the eyes of the author,which of the following statements is TRUE?B
A.Carnivorous plants cannot grow in acid soil.
B.Carnivorous plants can grow in nutrient-poor soil.
C.Carnivorous plants will die if they cannot catch any insects.
D.Carnivorous plants can get nitrogen from nutrient-rich soil.
分析 本文屬于說明文閱讀,作者通過這篇文章向我們介紹了食肉植物,人們一直認(rèn)為食肉植物對(duì)人類是有害的,但是作者在文章中闡述了食肉植物對(duì)人類是沒有任何危險(xiǎn)的,而且食肉植物可以在營養(yǎng)貧瘠的土壤中生長.
解答 66.D 細(xì)節(jié)理解題.根據(jù)第一段Some plants get so hungry that they eat flies,spiders,and even small frogs.What's more amazing is that these plants occur naturally (in special environments) in every state.In fact,they're found on every continent except Antarctica.可知食肉植物不能在南極洲生長,故選D.
67.C 細(xì)節(jié)理解題.根據(jù)第二段At the end of its stalks(莖)are specially modified leaves that act like traps.Inside each trap is a lining of tiny trigger(觸發(fā)) hairs.When an insect lands on them,the trap suddenly shut.可知捕蠅草是用它莖端特別改裝的像陷阱一樣的葉子捕食昆蟲,故選C.
68.D 推理判斷題,根據(jù)第三段Note:Despite any science-fiction stories you might have read,no meat-eating plant does any danger to humans.可知食肉植物對(duì)人類沒有任何的危險(xiǎn),故選D.
69.B 推理判斷題.根據(jù)最后一段They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity(酸度).可知食肉植物可以在營養(yǎng)貧瘠的土壤中生長,故選B.
點(diǎn)評(píng) 考查學(xué)生的細(xì)節(jié)理解和推理判斷能力.做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確選擇.在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.