A. reason for　　　　　　　　　　　　　　　　　　　　　　　　   B. cause of

C. cause to　　　　　　　　　　　　　　　　　　　　　　　　　　  D. reason of

Heat is the ________________ the expansion of matter.

A. reason for　　　　　　　　　　　　　　　　　　　　　　　　   B. cause of

C. cause to　　　　　　　　　　　　　　　　　　　　　　　　　　  D. reason of

Fred Michel is one of 7.2 million Americans who moonlight, or hold more than one job.
　　Once a week, after his day job as medical director of a mental health center, the 40-year-old psychiatrist (精神病大夫) heads to a part-time job at a treatment center for young people. Twice a month, he travels three hours to another teenage treatment center.
　　Last year, 5.4 percent of the American workforce held second jobs, according to the US Labor Department, and that looks set to increase this year.
　　Many workers like the safety that moonlighting provides, says Carl Hausamn, the writer of "Moonlighting: 148 Great Ways to Make Money to the Side."
　　The information from the US Labor Department shows that 40 percent of US moonlighters in 1997 took a second job to meet household expenses or pay off debts. Others save money or buy some special things.
　　People also take second jobs with an eye to the future - wanting to try out a new field or gain experience.
　　Michel started moonlighting when medical systems were unstable (不稳定的). He wanted to make sure he wasn't tied to one system that ended up failing.
　　Just as the purposes for moonlighting vary, the moonlighters cross all age and racial groups. And they work in a variety of industries - no longer just service, office and sale jobs.
　　“Technology just affects your ability to make money,” Hausman says. "That makes a frequent change in moonlighting."
　　As its name means, moonlighting still occurs mostly at night. And that results in some pressures. Chief among them is time.
　　Full-time employers could misunderstand, too. Some companies do not allow after-hour work because they fear it will affect their employees' 9-to-5 performance.
　　"The primary employer is saying, ‘Wait, I'm paying you for the sharp, fresh, energetic you,’” says Tom Gimbel, president and founder of LaSalle Staffing in Chicago. "If you' re burning yourself at both ends, it's going to show."
　　Still, the good done to the moonlighters can be great. Besides extra income, moonlighters enjoy variety, freedom and chance to do something new. They also may find their part-time jobs strengthen what they do full time.
　　Besides, "it's fun," Michel says. Not only do his part-time jobs offer a chance to network, stretch his professional skills and make more money, but they also give him the variety he wouldn't find just in a full-time job.
　　"It' s a way of pulling from the spice cabinet" he says, "and offering a little variety throughout the day."
60. What is the article mainly about?
　　A. The ways of moonlighting.
　　B. The reasons for moonlighting.
　　C. The problems with moonlighting.
　　D. The kinds of people who moonlight.
61. The reason why Fred Michel began to moonlight is that ________.
　　A. he found it exciting to do a part-time job
　　B. he needed to make ends meet with more money
　　C. he feared he would lose his present job one day
　　D. he felt more and more pressure from his employer
62. Some companies don't allow their workers to moonlight because they are afraid ________.
　　A. their workers can not do extra-hour work for them
　　B. their workers will be too tired to try their best at work
　　C. their workers will one day turn to some other different jobs
　　D. their workers will not get to work and be off work on time
63. The underlined sentence "It's a way of pulling from the spice cabinet." in the last paragraph means _________.
　　A. moonlighting gets you away from the job you don' t enjoy
　　B. moonlighting offers you freedom to make extra money
　　C. moonlighting strengthens your professional skills
D. moonlighting brings you chances to do something different

　　                                C
Among the more colorful characters of Leadville’s golden age were H.A.W. Tabor and his second wife, Elizabeth McCourt, better known as "Baby Doe". Their history is fast becoming one of the legends of the Old West. Horace Austin Warner Tabor was a school teacher in Vermont. With his first wife and two children he left Vermont by covered wagon in 1855 to homestead in Kansas. Perhaps he did not find farming to his liking, or perhaps he was attracted by rumors of fortunes to be made in Colorado mines. At any rate, a few years later he moved west to the small Colorado mining camp known as California Gulch, which he later renamed Leadville when he became its leading citizen. "A large amount of lead is sure to be found here." he said.  
　　As it turned out, it was silver, not lead, that was to make Leadville’s fortune and wealth. Tabor knew little about mining himself, so he opened a general store, which sold everything from boots to salt, flour, and tobacco. It was his custom to "grubstake" prospective（预期的） miners, in other words, to supply them with food and supplies, or"grub", while they looked for ore（矿石）, in return for which he would get a share in the mine if one was discovered. He did this for a number of years, but no one that he aided ever found anything of value.
　　Finally one day in the year 1878, so the story goes, two miners came in and asked for "grub". Tabor had decided to quit supplying it because he had lost too much money that way. These were persistent（坚持的）, however, and Tabor was too busy to argue with them. "Oh help yourself. One more time won’t make any difference," He said and went on selling shoes and hats to other customers. The two miners took $17 worth of supplies, in return for which they gave Tabor a one-third interest in their findings. They picked a barren place on the mountainside and began to dig. After nine days they struck a rich vein of silver. Tabor bought the shares of the other two men, and so the mine belonged to him alone. This mine, known as the "Pittsburgh Mine," made $1,300, 000 for Tabor in return for his $17 investment.
　　Later Tabor bought the Matchless Mine on another barren hillside just outside the town for $117,000.This turned out to be even more abundant than the Pittsburgh, producing $35 000 worth of silver per day at one time. Leadville grew. Tabor became its first mayor, and later became the governor of the state.  
49. The word "grubstake" in paragraph 2 means __________ .
　A. to supply miners with food and supplies
　B. to open a general store
　C. to do one’s contribution to the development of the mine
　D. to supply miners with food and supplies and in return get a share in the mine, if one was discovered
50.Tabor made his first fortune_________.
　A. by supplying two prospective miners and getting in return a one-third interest in the findings
　B. because he was persuaded by the two miners to quit supplying
　C. by buying the shares of the other
　D. as a land speculator（投机商）
51. The underlying（潜在的）reason for Tabor’s successful life career is __________.
　  A. purely accidental
B. based on the analysis of miner’s being very poor and their possibility of discovering
profitable mining site
C. through the help from his second wife
　　D. he planned well and accomplished targets step by step
52. If this passage is the first part of an article, who might be introduced in the following  part?
A. Tabor’s life.     　　                        B. Tabor’s second wife, Elizabeth McCourt.
　　C. Other colorful characters.　　         D. Tabor’s other careers.