题目内容
18.So hungry do some plants get 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 (茎) are specially modified leaves that act like traps.Inside each trap is a lining of tiny trigger (触发) 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.
24.According to the passage,carnivorous plantsB.
A.only grow in wild field
B.cannot grow on Antarctica
C.are as common as flies
D.are rare to see
25.Venus'flytrap preys on insects byD.
A.its numerous long and thin stalks
B.a container where it grows
C.the lining of tiny trigger hairs
D.its insect-catching leaves
26.We can conclude from the third paragraph thatB.
A.carnivorous plants are dangerous
B.carnivorous plants are harmless to humans
C.carnivorous plants occasionally eat books
D.carnivorous plants are fictional
27.In the eyes of the author,which of the following statements is TRUE?A
A.Carnivorous plants can grow in nutrient-poor soil.
B.Carnivorous plants cannot grow in acid soil.
C.Carnivorous plants will die if they cannot catch any insects.
D.Carnivorous plants can get nitrogen from nutrient-rich soil.
分析 本文是一篇科教类阅读,主要介绍了食肉动物的捕食过程、特征及其与非食肉植物的区别等.
解答 24-27 BDBA
24题答案:B考查细节推理,根据文章第一段的In fact,they're found on every continent except Antarctica.事实上除了南极洲以外人们在每个陆地都能发现它们(食肉植物).可知本题答案为B选项.
25题答案:D考查细节推理,根据文章第二段的At the end of its stalks (茎) are specially modified leaves that act like traps.Inside each trap is a lining of tiny trigger (触发) 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.在它的茎末段是特殊的像夹子一样的叶子,在每个夹子(叶子)的内部排列着小的触发.当昆虫落在它们上面时,夹子会突然关闭.在大约一个星期的时间内,植物依靠它们所捕获的昆虫为食.可知本题答案为D选项.
26题答案:B考查细节推理,根据文章第三段的…no meat-eating plant does any danger to humans.没有一种食肉植物对人类有任何危险.可知本题答案为B选项.
27题答案:A根据文章最后一段的They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity.它们(食肉植物)生活在营养物很难或不可能从土壤中获得(因为土壤的酸性)的地方.故本题答案为A选项.
点评 本文是一篇科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对 性找出相关语句进行仔细分析,结合选项选出正确答案.推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案.