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(果凍一樣的塊狀物)of their eggs to the undersides of leaves.The leaves hang on branches that dangle(懸掛)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.a(chǎn)re less common among young animals
C.help animals move a lot to fit the environment
D.a(chǎn)re 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.a(chǎn)re 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 本文是一篇科教類閱讀,主要講述了其實(shí)"害怕"也是件好事,因?yàn)樗軌蚴刮覀冏?保持我們繼續(xù)活著"的事情.
解答 68-70.DAC
68題答案:D考查細(xì)節(jié)推理,根據(jù)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."生態(tài)學(xué)家Karen Warkentin說"害怕重要,它是一個(gè)好東西,因?yàn)楹ε率鼓阕霰3帜慊钪氖虑?可知"害怕對于動(dòng)物的生存而言或多或少是重要的",故本題答案為D選項(xiàng).
69題答案:A考查細(xì)節(jié)推理題,根據(jù)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"樹蛙"在卵及水里都會面臨危險(xiǎn),故本題答案為A選項(xiàng).
70題答案:C考查細(xì)節(jié)推理,根據(jù)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.可知后面會接著講其它動(dòng)物以人意想不到的方式對危險(xiǎn)做出反應(yīng)的例子,故本題答案為C選項(xiàng).
點(diǎn)評 本文是一篇科教類閱讀,題目涉及多道細(xì)節(jié)理解題,做題時(shí)結(jié)合原文和題目有針對 性找出相關(guān)語句進(jìn)行仔細(xì)分析,結(jié)合選項(xiàng)選出正確答案.推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案.