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Basketball is a sport enjoyed by millions of fans in at least 100 countries. It's one of the best-known sports in the worlD.It all began in 1891.
Dr. James A.Naismith, the father of basketball, was an instructor at a YMCA(基督教) Training school. The school trained people to work in YMCAs. Officials at the school were concerned about the low attendance during the winter months. They felt that people didn't attend then because the school did not have a good winter sports program. So they asked Dr. Naismith for help. He came up with a new indoor gamE.
Naismith studied current games. He found that all the most popular games used a ball. So a ball would be a part of his new game, he decideD.But kicking the ball or hitting it would be too rough for indoor. So he put 2 peach baskets up on poles. The players had to try to throw a soccer ball into them. Naismith then made thirteen rules for the gamE.12 of them are still in use today. Just 7 years after the game began, professional basketball teams were formeD.
And that's how basketball was born.
Which of the following would be the best title for the passage?
A.The Birth of Basketball
B.YMCA and Basketball
C.Basketball——an Indoor Game
D.A Winter Sports Program

A.B.
C.
D.
Which
E.The
F.YMCA
G.Basketball——an
H.A

【参考答案】

A
解析：归纳总结题。文章最后一段“And that's how basketball was born”是对全文的总结。

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A metal with a built in memory is one of the very useful discoveries made during America's space program. Nitinol was discovered by scientists working at the Naval Surface Weapons Center. They were looking for heat shield metals for missiles and satellites, but what they found was nitinol. This alloy can be formed into shapes just like any other metal, but it returns to its original form. at a certain temperaturE.When this alloy of nickel and titanium is first formed, it is shaped into ingots, brick shaped masses of the metal. Then it is drawn out into a wire of varying thickness, depending on the job it is destined to do. It is set into its desired curve or shape and heated briefly. It is then cooled off by dipping the wire in cold water. This 'sets' its memory. The metal can then be formed into any desired shape, but whenever its temperature exceeds its room temperature, ' it returns to the shape it has memorizeD.This makes nitinol perfect, of course, for, spacecraft, for antennas, probes, shields, and folding 'arms' made of nitinol can be stored safely inside a spacecraft, protecting them from damage during launching. Then, once safe in orbit, the spacecraft would suddenly 'grow' antennas and other structures. The sun's rays would have warmed up the folded and coiled nitinol, and it would have returned to its original shapE.But scientists have found a more down to earth use for this wire: they now use it to strengthen teeth. Before nitinol, teeth that needed straightening have brackets attached to them; wires were attached to these to exert a pull in the right direction. But this pull must be constant, and the stainless steel arch wire cannot exert the correct force if it has been bent several times or if the tooth has actually moved toward it as planneD.As a result, many people with dental braces must have the wire replaced monthly, tightened every few weeks, or adjusted painfully tight at the beginning of the treatment.But nitinol wires can be formed to exert force in a certain direction, cooled of and then reformed to fit the patient's mouth. As the mouth warms the nitinol, it begins to try to assume its preset shapE.This exerts a steadier, more constant pull on the tooth than could ever be achieved with stainless steel wirE.Nitinol can be bent into such intricate shapes — while maintaining its pull — that very difficult treatments, such as moving one tooth from behind another, can be done now without the expense or pain of constant adjustment. Nitinol has cut tile time needed for these treatments by almost half, a real benefit for both patient and dentist.The main idea of this passage is that ______.A.nitinol is a highly versatile metalB.nitinol helped make the space program a successC.nitinol has revolutionized dental careD.most alloys have 'memories'

A.B.
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The
F.
A.nitinol
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