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46、What effect can dim lights of an eating environment bring about?
A． Arousing active thinkin
B． Improving work efficienc
C． Creating a tense atmospher
D． Stimulating talks among peopl

47、The underlined word "serene" in the last sentence is closed in meaning to __
A． serious and grave
B． calm and peaceful
C． pleasant and friendly
D． cold and indifferent

48、根据下列材料，请回答48-67题： There is nothing more possible than a new hip or knee that can put the spring back in your step. Patients receiving joint implants (移植) often are able to resume many of the physical activities they love, even those as vigorous as tennis and hiking. No wonder, then, that joint replacement is growing in popularity.
In the United States in 2007, surgeons performed about 806,000 hip and knee implants (the joints most commonly replaced), double the number of performed a decade earlier. Though these procedures have become routine, they are not failure free.
"Implants must sometimes be replaced," said Dr. Henrik Malchau, an orthopedic surgeon (矫正外科医生) at Massachusetts General Hospital in Boston. A study published in 2007 found that 7 percent of hips implanted in Medicare patients had to be replaced within seven and a half years.
"The percentage may sound low, but the finding suggests that thousands of hip patients eventually require a second operation," said Dr. Malchau. Those patients must endure additional recoveries, often painful, and increased medical expenses.
The failure rate should be lower, many experts agree. Sweden, for instance, has a failure rate estimated to be a third of that in the United States. Sweden also has a national joint replacement registry, a database of information from which surgeons can learn how and why certain procedures go wrong. A registry also helps surgeons learn quickly whether a specific type of implant is particularly problematic. "Even country that has developed a registry has been able to reduce failure rates significantly," said Dr. Daniel Berry, chief of orthopedic surgery at the Mayo Clinic in Rochester, Minn.
A newly formed American Joint Replacement Registry will begin gathering data from hospitals in the next 12 to 18 months. It's good news for those who are considering replacing a knee or hip. What is the problem with hip or knee replacement in the U.S.?
A． A lot of patients need a second operatio
B． Doctors are not well trained to ensure successful operatio
C． Demands for hip replacement exceed the number of surgeon
D． Replacement operation is becoming too expensive in hospital

49、Why does Sweden have a lower rate of hip implant failure?
A． Because Sweden has more advanced technolog
B． Because Sweden has a patient data collecting syste
C． Because Sweden has a much larger number of patient
D． Because Swedish doctors are more responsible and skillfu

50、People who need a new knee or hip would possibly feel __ about data gathering in the U.S.
A． indifferent
B． assured
C． puzzled
D． hopeful

51、People who need a new knee or hip would possibly feel __ about data gathering in the U.S.
A． indifferent
B． assured
C． puzzled
D． hopeful

52、根据下列材料，请回答52-71题：
The Saturday Evening Post "became symbolic of the reading fare of middle-class America". In 1897 Curtis began to revive (重振) the Post on the proposition that a man's chief interest in life is the fight for livelihood -- business. Fiction and articles about romantic business and successful businessmen filled its pages, and products backed by its advertisements directed at the needs and desires of the business world. The general interest weekly reached new audiences. Its conservative viewpoint and strong admiration for material success appealed to the tastes of the millions who settled in an easy chair with it each Thursday evening. As a more commercial, mass-circulation magazine than The New Yorker, the widely readable Post set out to interpret America to itself.
As a national and international institution, The Saturday Evening Post made its mark in the lives of massive numbers of men and women, and served society as a stabilizing influence. Its editorial matter addressed the problems and interests of the readers as never before. Neither highbrow nor lowbrow, the Post set out to interpret average middle-class America, for that was its audience. However, this magazine lost touch with the mood of the American people in the 1930s. The Post's editor Lorimer, opposed Roosevelt and the New Deal and changed his magazine from an organ of entertainment and enlightenment into a weapon of political warfare. He believed that in opposing the New Deal he had spoken for the majority of voters, but the 1936 election proved him wrong. His conservatism extended beyond politics, it dominated the magazine's content and style causing a decline in reputation and authority. The Post met its greatest success when it went beyond the tastes of the masses, challenging its readers to acknowledge the genius of contributors such as F. Scott Fitzgerald and William Faulkner. It was later reformed in an effort to fulfill its responsibility to awaken lethargic (昏昏欲睡的)America, however, The Saturday Evening Post seemed to play to conventions while The New Yorker took off to redefine the character of American Humor.
According to Paragraph 1, who are primarily the readers of the Post?
A. Businessmen.
B. College students.
C. Housewives.
D. Politicians.

53、What is the earliest time that readers can read the Post every week?
A． Monda
B． Thursda
C． Saturda
D． Sunda

54、Why did the Post lose much of its audience in the 1930s?
A． Because it changed its original Style and was heavily involved in politic
B． Because readers couldn't afford a newspaper because of the Depressio
C． Because the new editor was not interested in Roosevelt's politic
D． Because it failed to absorb sufficient advertisement

55、What makes the Post so commercially successful?
A． Presenting American style humo
B． Sticking to the tastes of the middle-clas
C． Carrying articles and novels by local writer
D． Staying in close contact with the business worl