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四、阅读理解
36、 回答36-55题
Gold used in jewelry is mixed with harder metals to add strength and durability．The metals added can also be used to change gold' s color, giving it a fashionable rose or white tint, or to lighten or darken the natural yellow tone of pure gold．Mixtures like these, of less costly metals with more valuable ones, are called alloys．Copper and silver are the most common metals mixed with gold to make yellow gold jewelry．White gold is usually made with an alloy of gold and nickel．The measure of gold' s purity is called a karat．The higher the karat rating, the higher the amountof pure gold: 24 karat is pure gold, 15 karat is 75% pure gold, 14 karat is 58.5% pure gold, and 9karat is 37.5% pure gold．All other things being equal, the higher the percentage of pure gold used in the alloy, the more valuable and expensive the jewelry will be．Gold jewelry pieces are usually stamped with a marking to identify the karat amount．While goldthat is 24K is too soft for jewelry, 18K, 14K and 9K gold are all appropriate for jewelry, and they allmake pieces that look great and wear beautifully．

Which of the following statements best captures the main idea of this passage?
A．Although gold is very valuable, it is also very expensive．
B．Gold jewelry is stamped with its karat weight．
C．Gold jewelry is made using alloys．
D．Colored gold is more valuable than white gold．


37、 Based on information in the passage, it can be understood that pure gold is________
A．not used to make rings
B．stamped with 100K
C．an alloy of different metals
D．colorless


38、
According to the passage, the use of other metals in gold alloys________
Ⅰ．can be used to make the gold different color
Ⅱ．makes jewelry more expensive
Ⅲ．makes gold more flexible
A．I only
B．I and Ⅱ only
C．Ⅱ and Ⅲ only
D．I , Ⅱ ,and Ⅲ


39、
Which of the following statements best explains the relationship between gold and its karat rating?
A．The lower the karat rating,the purer the gold．
B．The higher the karat rating,the more expensive the gold．
C．The higher the karat rating,the less valuable the mixture．
D．The lower the karat rating,the purer the alloy.

40、回答40-59题
A few minutes ago, walking back from lunch, I started to cross the street when I heard the sound of a coin dropping．It wasn't much but, as I turned, my eyes caught the heads of several other people turning too．A woman had dropped what appeared to be a dime．The tinkling sound of a coin dropping on pavement is an attention-getter．It can be nothing more than a penny．Whatever the coin is, no one ignores the sound of it．It got me thinking aboutsounds again．We are besieged(包围) by so many sounds that attract the most attention．People in New YorkCity seldom turn to look when a fire engine, a police car or an ambulance comes screaming along the street．When I'm in New York, I'm a New Yorker．I don't turn either．Like the natives．At home in my little town in Connecticut, it's different．The distant wail of a police ear, anemergency vehicle or a fire siren brings me to my feet if I'm seated and brings me to the window if I'm in bed．It's the quietest sounds that have most effect on us, not the loudest．In the middle of the night, Ican hear a dripping tap a hundred yards away through three closed doors．I've been hearing little creaking noises and sounds which my imagination turns into footsteps in the middle of the night for twenty-five years in our house．How come I never hear those sounds in the daytime?

The sound of a coin dropping makes people________
A．think of money
B．look at each other
C．pay attention to it
D．stop crossing the street


41、 People in New York________
A．don't care about emergencies
B．are used to alarm
C．are attracted by sounds
D．don't hear loud noises


42、
How does the author relate to sounds at night?
A．He imagines sounds that do not exist．
B．He overstates quiet sounds．
C．He thinks taps should be turned off．
D．He believes it's rather quiet at night．


43、
How does the writer feel about sounds in general?
A．They make him feel at home．
B．He thinks they should be ignored．
C．He believes they are part of our lives．
D．He prefers silence to loud noises．

44、 回答44-63题
Sports have always been ruled by the weather．Rain, sleet, snow and cold called the plays．Baseball fans have often sat in the rain without cover, waiting for the sun to come out and the game to begin．Football lovers sometimes took days to warm up after sitting through a freezing cold Sunday game．For both sports fans and players, the domed stadium was like something out of a dream．A huge plastic bubble kept out rain and snow．There was heat to keep things comfortable year round．Domed stadiums have clearly changed the course of sports．Still, they did have their problems atfirst．Most of these problems were discovered and solved at the Houston Astrodome．This was the world's first stadium with a lid．For the fans, it was great．But there were some problems for the players．Baseball outfielders had the most difficult time．They had to learn to catch in a field with a roof．At first this was almost as difficult as playing in the dark．The glass of the roof was light colored, to let sunlight in．Sunlight was needed to keep the grass on the field alive．But the light roof blended(混合)too welt with the white baseball．Fly balls seemed to drop out of nowhere．Even skilled fielders were making errors．Finally, the decision was made to paint the glass of the roof dark．The problem was solved．But what about the grass? Well, the real grass was dug up and replaced with artificial turf!

This passage is about ________
A．baseball games
B．cold weather
C．how to play outfield
D．domed stadiums


45、 Domed stadiums must have________
A．artificial grass
B．bright sunlight
C．stained glass roofs
D．bright lighting

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