Question

【題目】根據(jù)短文內(nèi)容，從下面方框中選擇適當?shù)倪x項補全短文

Do you have a tail？ Of course not， we know． But tails are like opinions． actually， everyone

has them： fishes， birds， most reptiles， and even some of our closest relatives

Since tails tirst evolved（進化） at least 500 million years ago． Geckos （壁虎）use them to store fat． birds use them to steer through the air， But for most mammals （哺乳動物）．【1】Yet， as you get closer to humans on the evolutionary tree， tails disappear， Gorillas（大猩猩）don' t have them， and neither do chimps（黑猩猩） or any other apes （類人猿） including us， of course， To understand why， take a look at how we walk．

【2】walking like this gives us a huge advantage because unlike four﹣legged animals．which have to pour energy into every step they take， two legs take advantage of gravity（重力），which does some of the work for us． You see， each time we take a step， gravity pulls us forward．The end result is that when we walk， we use around 25% less energy than walking on all fours， and this way of getting around also totally climinates（淘汰） the need for a tail．

It's said that you can still see a reminder of a time when our ancient ancestors had one． Just look at a human spine（脊椎）．【3】That's your tailbone． It's all that's the rest of our tail．

Now， babies are born with what looks like a tail， but that's not what's really going on． Most often， these tails are actually a parasitic twin（寄生蟲）． These types of tails usually form as a birth fect（瑕疵）．【4】

So the tail of humans has gone， it's the result of evolution millions of years Will humans be much taller， stronger or smarter in the future？

A． Nowadays， humans can walk completely upright．

B． And in these situations， doctors will advise to remove the tails with no harm to the babies

C． they serve one major purpose﹣﹣balance．

D． You can see how the last few bones are partly fused（融合） together

Answer 1

【答案】

【1】C

【2】A

【3】D

【4】B

【解析】

短文大意：本文是科普類閱讀，介紹了人類“尾巴”的進化過程，指出人類的尾巴是數(shù)百萬年進化的結(jié)果，預計人類將來會變得更高、更強、更聰明。

【1】C but但是，表轉(zhuǎn)折；根據(jù)前句Geckos use them to store fat, birds use them to steer through the air可知列舉了尾巴的作用，備選項But for most mammals, they serve one major purpose—balance介紹的是哺乳動物尾巴的重要作用﹣﹣保持平衡．故選C。

【2】A 根據(jù)后句walking like this gives us a huge advantage because unlike four﹣legged animals像這樣走路給了我們巨大的優(yōu)勢，因為不像四條腿的動物；結(jié)合選項可知說現(xiàn)在人類可以完全直立行走．Nowadays, humans can walk completely upright符合文意，故選A。

【3】D 根據(jù)前句Just look at a human spine看看人類的脊椎；結(jié)合選項，可知You can see how the last few bones are partly fused together介紹了看到的東西：最后幾根骨頭是如何部分融合在一起的，符合句意，故選D。

【4】B 根據(jù)前句These types of tails usually form as a birth fect這些類型的尾巴通常形成一個瑕疵，可知在這種情況下，醫(yī)生會建議在不傷害嬰兒的情況下切除尾巴，And in these situations， doctors will advise to remove the tails with no harm to the babies符合文意，故選B。