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8.Have you ever noticed that your fingertips are winked when you've just finished swimming or washing dishes?It seems as if your hands have aged 30years i a second.But is this an accident?Or is it something that nature has built into our bodies?
If your finger's wrinkling up had no use at all,"it wouldn't need to."Professor Tom Smulders from Newcastle University,UK,told BBC News.By studying wet fingers closely,Smulders and his partners found that the wrinkles looked a bit like the patterns on the car tire or o the bottom of the running shoes.So they made a guess that wrinkles on fingers might be able to help the hand hold things more tightly.
To testthis,researchers asked 20people to pick up marbles from water with their hands.But before they started,some of the people had to keep their hands in water for half an hour.
The researchers found that the people with wrinkled fingers completed the task the task faster than those with dry hands.But when they were asked to move dry marbles,all the people performed equally well,no matter they had the wrinkled fingers or not.
Our ancestors might not have played with marbles,but wrinkled fingers could have made it easier for them to climb around in the wet forests and catch fish from rivers,researchers say.
Similarly,our toes also get wrinkled in water.This may have developed from our ancestor's need to run on wet ground.
But the question is,if wrinkled fingers are so helpful,why don't our hands just stay that way all the time?Researchers explained that wrinkling has its disadvantage:wet fingertips are far less sensitive than smooth ones,reducing our sense of touch.

26,What does the underlined world"this"in the third paragraph refer to?B
A.Wether fingers have wrinkles after they are put in water.
B.Wether wrinkled fingers can hold things more tightly.
C.Why keeping things in water makes them wrinkled.
D.Why wrinkles help hands hold things more tightly.
27,The test shows thatC.
A.winkled hands hold dry things more tightly than dry hands do.
B.dry hands hold dry things more tightly than wrinkled hands do.
C.winkled hands hold wet things more tightly than dry hands do.
D.dry hands hold wet things more tightly than wrinkled hands do.
28.What might be the disadvantage of wrinkled fingers?D
A.They are too sensitive to be touched.
B.They might be more likely to get hurt.
C.They cannot hold things tightly enough.
D.They are not so sensitive as dry fingers.

分析 短文大意:
這篇短文主要通過一個小實驗說明了手指的皮膚起皺對于我們把握東西的好處,其好處就在于手指上的皺紋可以讓我們握東西時更緊,這個已經通過實驗證實了,有皺紋的手更容易握緊濕的東西.
同時也指出了這一生理現象的不足之處,那就是感覺不太靈敏了,在很大程度上降低了我們的觸感.

解答 26.B,推理判斷題,聯系上一段中最后一句話描述,"So they made a guess that wrinkles on fingers might be able to help the hand hold things more tightly."猜想手指上的皺紋可以讓我們握東西時更緊,可知此處this指的是,起皺的手指是否能更緊地抓住東西這個猜想.故選B.
27.C,推理判斷題,根據第四段The researchers found that the people with wrinkled fingers completed the task the task faster than those with dry hands.描述,可知有皺紋的手更容易握緊濕的東西,所以選C.
28.D,推理判斷題,根據最后一段Researchers explained that wrinkling has its disadvantage:wet fingertips are far less sensitive than smooth ones,reducing our sense of touch.描述,可知,有皺紋的缺點就在于感覺不太靈敏,很大程度上降低了我們的觸感.可知選D.

點評 本文是一篇科普類文章.做題時要在理解好文意的基礎上,與題目有機的結合,從文章中找到相關細節(jié)性的句子與選項細細比對,進行選擇或推理判斷,選出符合文章內容的正確選項.做題注意靈活,有時可采用排除法或直選法確定出最終答案.

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