Directions：Read the following three passages．Each passage is followed by several questions or unfinished statements．For each of them there are four choices marked A, B, C and D．Choose the one that fits best according to the information given in the passage．

　　A rccent study of anclent and modern clcphants has come up with the uncxpeclcd conclusion that the african elcphant is dividcd into two disinct(不同的)species

　　The discovery was made by researchers at yod and haycard yniwersities when they were examining the genetid relinship between the ancient woolly manmmth and mastodon to modern ckephants ins asoan alepnant a feoan forest elephant and afcican sannna clephant

　　Once they obfantcd DNA sequences{序列}from two fossils{化石}，mammothd and mastodons the team comparcd them with dna form ，modcrn eleohants they found to their amazement that modern forest and sabanna elephants are as distinct from cach other as asian elephants and manmoths he scientists used detailed genetic anatysis to proce that the african savanna clelhants hace been distinct species for several million years the divcrgonce of the ttwo species took place around the time of the of the dicergcncc of asian clephants and woolly mammoths this result amazed all the scienitsts

　　There has long been debate in the scientific community that the two might be separespecies but this is the most convincing scientinfic evidence so far that they are anded difforent species

　　Preci many naluralists believed that afrjcan savanna elephants and airican forest were two plpulations of the same apecies despite the clcphants signigice\ant sizw differences the sac\vanna elelphant has an average shouldcr height of 3.5metres while the forest slsphant has an average shouldcr height of 2.5metres the sacanna laphant welghs belween six anp secedn tons roughly double the weight of the forest elephant but the fact that they look so different does not neccssarily mean they are different species howecer the prooflay in the analysis of th DNA

　　Alfred roca allisant professor in the dcoamment of animal scienccs at the unicerstiu of said “wu now nave to reat the forest and savanna elephants at two diffcrcnt units for consrrbation pucpooses since 1950 all african ele[hants are two cery distinctice animals the forest ele[hant shoule become a bigger prioity(优先)for conscrvation puruose”

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阅读理解

　　You are watching a film in which two men are having a fight．They hit one another hard．At the start they only fight with their fists(拳头)．But soon they begin hitting one another over the heads with chairs．And so it goes on until one of the men crashes through a window and falls thirty feet to the ground below．He is dead!

　　Of course he isn't really dead．With any luck he isn't even hurt．Why? Because the men who fall out of high windows or jump from fast moving trains, who crash cars of even catch fire, are professionals(专业人士)．They do this for a living．These men are called stuntmen(替身演员)．That is to say, they perform tricks．

　　There are two sides to their work．．They actually do most of the things you see on the screen．For example, they fall from a high building．However, they do not fall on to hard ground but on to empty cardboard boxes covered with a mattress(床垫)．Again, when they hit one another with chairs, the chairs are made of soft wood and when they crash through windows, the glass is made of sugar!

　　But although their work depends on trick of this sort, it also requires a high degree of skill and training．Often a stuntman's success depends on careful timing(时间测量)．For example, when he is "blown up"in a battle scene, he has to jump out of the way of th explosion(爆炸)just at the right moment．

　　Naturally stuntmen are well paid for their work, but they lead dangerous lives．They often get seriously injured, and sometimes killed．A Norwegian stuntman, for example, skied over the edge of a cliff(悬崖)a thousand feet high．His parachute failed to open, and he was killed．

　　In spite of all the risks, this is no longer a profession for men only．Men no longer dress up as women when actresses have to perform some dangerous action．For nowadays there are stunt-girls too!

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