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据下表资料，如果服用两药后的血压下降值服从正态分布，能否认为服用这两种降压药后，两血压下降值总体平均数相等，服两药后血压下降的mmHg值
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A．By way of broadcasts.B．By way of TV.C．By way of film.D．By way of newspaper.
听力原文：W: Good evening! Welcome to our Talk Show program. Our guest today is Mr. David Smith, who had the experiences of studying abroad for seven years and then returning back home. Well, Mr. Smith, do you think going abroad was the hard part？
M: I don't think so, but returning back home was really hard.
W: Why？
M: Well, for many students, returning back to their home countries can be a very confusing experience.
W: Re-entry Shock! That sounds quite interesting. Can you explain it？
M: For example, many students who come to the United States experience freedoms they have never enjoyed in their country.
W: Sure, such as freedom from family, freedom from cultural norms they didn't like and freedom from the pressures of working in a real job.
M: However, too much freedom and unstructured life can lead to other problems. Students sometimes skip classes, stay out late, and engage in activities that their families and cultures might not approve of, but students want to enjoy "freedom" while it lasts.
W: So when students return back to their countries, they can struggle with fitting back into the cultural norms and family expectations of the past.
M: Yes. Naturally, depression is possible and a loss of self can result.
W: Then what can students do to minimize this Re-entry Shock？
M: First of all, keep in contact with your family and friends while you are abroad. They will be your first source of advice and support once you return.
W: What else？
M: Second, have a clear plan what you will do when you return. Start looking for a job now or apply to enter a school months before you return. Re-entry Shock can be greatest when you have nothing to do when you return.
(23)
听力原文： Throughout history, sports have played an important role in society. Not only have they been a source of entertainment for both the player and the spectator, but they have served as a pleasurable way of ensuring the physical fitness of citizens of all ages.
The popularity of different sports varies from one country to another. Factors such as tradition, climate and cost obviously influence the types of sports that are played by both amateur and professional athletes in various countries. Contrary to winter sports like ice hockey and downhill skiing, table tennis, badminton and fishing, for example, do not require expensive equipment or expensive sports facilities.
Television has increased the popularity of sports like football, basketball, tennis and golf. Millions of men and women all over the world watch live broadcasts of the Olympic Games and the World Cup, for example. Star athletes become the topic of conversation, and often serve as models of courage and determination. The re cord-breaking accomplishments of many athletes are inspirational examples of men and women approaching the limits of human endeavor. Although their performances have been enhanced by major improvements in equipment and training, these sports stars usually deserve the glory and celebrity status they receive.
However, many educators feel that too much emphasis has been placed on the development of professional athletes. Physical education teachers often stress the importance of competitive sports for all young people, not just a select few of the excellent ones. They point out that sports help channel energy in a positive way and contribute to the development of determination and self-discipline. All boys and girls, irrespective of their athletic abilities, should be able to benefit from the joys and disappointments of competitive sports.
(33)
A．Significantly increasing the temperature of the Earth.B．Significantly cooling the Ea
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