阅读下列短文，从每题所给的四个选项（A, B, C和D）中，选出最佳选项。 In the United States, it is not customary(习惯) to telephone someone very early in the morning. If you telephone him early in the day, while he is shaving or having breakfast, the time of the call shows that the matter is very important and requires immediate attention. The same meaning is attached to telephone calls made after 11:00 p.m. If someone receives a call during sleeping hours, he assumes it's a matter of life or death. The time chosen for the call communicates its importance. In social life, time plays a very important part. In the U.S.A. guests tend to feel they are not highly regarded if the invitation to a dinner party is extended only three or four days before the party date. But it is not true in all countries. In other areas of the world, it may be considered foolish to make an appointment too far in advance because plans which are made for a date more than a week away tend to be forgotten. The meaning of time differs in different parts of the world. Thus, misunderstandings arise between people from different cultures that treat time differently. Promptness is valued highly in American life, for example. If people are not prompt, they may be regarded as impolite or not fully responsible. In the U.S. no one would think of keeping a business associate waiting for an hour, it would be too impolite. A person who is 5 minutes late, will say a few words of explanation, though perhaps he will not complete the sentence. 1.What is the main idea of this passage? _____ A. It is not customary to telephone someone in the morning and in sleeping hours in the U.S. B. The role of time in social life over the world. C. If people are not prompt, they may be regarded as impolite or not fully responsible in the U.S. D. Not every country treats the concept of time as the same. 2.Which of the following time is proper if you want to make an appointment with your friend? _____ A. at 7:00 am. B. at 4:00 pm. C. at the midnight. D. at 4:00 am. 3.Which of the following statements is true according to the passage? _____ A. In the U.S.A. guests tend to feel they are highly regarded if the invitation to a dinner party is extended only three or four days before the party date. B. There is no misunderstanding arising between people from different cultures about the concept of time. C. It may be considered foolish to make an appointment well in advance in the U.S.A.. D. Promptness is valued highly in American life. 4.From the passage we can safely infer that _____. A. it's a matter of life or death if you call someone in day time B. the meaning of time differs in different parts of the world C. it makes no difference in the U.S. whether you are early or late for a business party D. if a person is late for a date, he needn't make some explanation