10.If you are afraid of the dark,it's not a big deal.It's perfectly normal to feel afraid After all,animals do too."Fear matters,"says Karen Warkentin,an ecologist."It's a good thing,"she adds,"because fear makes you do things that keep you alive."
Like kids,many animals experience fear and they respond to the feeling in variety of ways.A frightened turtle pulls its head and legs inside its shell.A small fish will swim away when a big,hungry fish approaches.
Some animals respond to fear in ways you might not expect.The first example is that the fear of being eaten can scare some frogs right out of their eggs.Warkentin made the surprising discovery while studying red-eyed tree frogs in Costa Rica.
In this species,female frogs attach jellylike clumps(果冻一样的块状物)of their eggs to the undersides of leaves.The leaves hang on branches that dangle(悬挂)over ponds.After they hatch from the eggs,the tadpoles(蝌蚪)then fall into the water,where they eventually grow into
adult frogs.
Tree frog eggs usually grow for 6 days before hatching.If they sense that a hungry snake is about to attack,however,they can hatch up to 2 days ahead of schedule.As the snakes are unable to swim,by falling into the water early,the tadpoles can escape.
If hatching early helps protect red-eyed tree frogs from snakes,you might wonder why their eggs don't always hatch sooner.It turns out that hatching early brings its own danger.Once tadpoles land in the water,hungry fish and other animals like to eat them too.Staying in their eggs for a full 6 days,then,allows frog embryos(胚胎)to grow big and strong.This extra growth improves their chances of surviving in the water.
68.It can be inferred from the passage that fears.D
A.help animals grow bigger and stronger
B.are less common among young animals
C.help animals move a lot to fit the environment
D.are more or less important in order for animals to survive
69.We are told in the passage that tree frogsA.
A.face danger both inside their eggs and in the water
B.will grow fast if they fall into the water later
C.are surprisingly clever when inside their eggs
D.stay in their eggs longer if they are frightened
70.What do you think would be discussed in the following paragraph?C
A.Further explanations as to why tree frogs hatch ahead of schedule.
B.How the unborn frogs know when a snake is about to attack them.
C.Another example of animals that responds to fear in an unexpected way.
D.How tree frogs improve their chances of survival before falling into the.
分析 本文是一篇科教类阅读,主要讲述了其实"害怕"也是件好事,因为它能够使我们做"保持我们继续活着"的事情.
解答 68-70.DAC
68题答案:D考查细节推理,根据文章第一段中的."Fear matters,"says Karen Warkentin,an ecologist."It's a good thing,"she adds,"because fear makes you do things that keep you alive."生态学家Karen Warkentin说"害怕重要,它是一个好东西,因为害怕使你做保持你活着的事情"可知"害怕对于动物的生存而言或多或少是重要的",故本题答案为D选项.
69题答案:A考查细节推理题,根据文章第五段If they sense that a hungry snake is about to attack,they can hatch up to 2 days ahead of schedule.及第六段的Once tadpoles land in the water,hungry fish and other animals like to eat them too.可知"树蛙"在卵及水里都会面临危险,故本题答案为A选项.
70题答案:C考查细节推理,根据文章第三段的The first example is that the fear of being eaten can scare some frogs right out of their eggs.可知后面会接着讲其它动物以人意想不到的方式对危险做出反应的例子,故本题答案为C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.