题型：语法填空（语篇） 题类：常考题 难易度：困难
贵州省遵义市2016-2017学年高二下学期英语期末考试试卷
How long can a person live?How tall can a human being grow?The Guinness（吉尼斯）World Records book lists many of the greatest recordsthe greatest potentials（潜能）.But it's a fossil record.It speaks only to what has been done,not how much can(do),which is why it has to be constantly updated（更新）.
Take the(surprise )case of the British middle-distance runner Roger Bannister for example.In the 1950s, experts saidthe human body could not run a mile in less than four minutes.Then Bannister came along in 1954 and proved it couldact be run in 3:59.4.Once Bannister broke the imaginary barrier(sudden )the floodgates opened;scores of runners started besting（击败）the four-minute mark every year,each one(fast) than the last. How fast does a human have the ability(run)the mile today?We honestly don't know.That is why we hold our(breathe )during every Olympics.
All we know(be)that this kind of change is possible.Keep this in mind the next time you feel stuck or challenged.Just because it hasn't been done before doesn't mean it's impossible.
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