完形填空：

　　Each person sends out a special smell. It is 1 body smell by physiologists(生理学家). The 2 people have and the physical conditions of 3 are different from person to person. So is the body smell. For those who are fond of 4 , the body smell is strong .The Americans, 5 , have the body smell similar to that of buffaloes(水牛). The vegetarians(素食者) , on the other hand, have a 6 body smell.

　　Scientific studies of the body smell 7 that it consists of hundreds of elements, 8 out from the human body. It is , therefore, 9 for doctors to discover the nature of 10 . Some people have 11 that soaps and perfumes(香水) with body smell of women be 12 by astronauts and explorers at the South Pole.

　　It has been a custom for the 13 to find the criminal (罪犯) according to the 14 .The dogs are 15 to tell smell of different people.

　　Body smell can 16 be used to make locks. Japanese scientists have 17 a lock that reacts to the specific smell. When the 18 of the house stands in front of the door, his smell will be 19 and checked by a certain sensor on the lock. 20 will soon be sent to the lock if the smell is 21 .

　　A 22 body smell is found to be able to 23 her baby at ease. French physiologists have found that the baby will be very 24 and will fall into sleep quickly 25 put beside the mother's scarf.

Friendship is one of the basic bonds (纽带) between human beings. While the characteristics of friendship might vary from one country to another, people from all cultures not only enjoy friends but need them.

　　Many studies have shown that teenagers who have no friends often suffer from psychological disorders. It has been shown that teenagers, perhaps more than any other age group, need companionship and a sense of belonging. The negative consequences of loneliness have also been observed among the elderly. The death of a spouse often leaves a widow or a widower totally bereft (失去). If, however, they are surrounded by friends and relatives and if they are able to articulate（清楚表达） their feelings, they are more likely to recover from their grief.

　　“No man is an island.” In other words, we are all parts of society. We all need the love, admiration, respect and moral support of other people. If we are fortunate, our friends will provide us with all of these necessary aspects of life.

　　As most people observe, there are many levels of friendship. The degree or intensity of friendship varies depending on the personality of the individuals involved and the context of the relationships. Extroverts (性格外向者) enjoy being surrounded by many people whereas introverts（性格内向者）are perhaps content with fewer but more intense friendships.

　　Everyone is not equally open with all their friends. The degree of intimacy (密切) is determined by many factors. Close friends can be formed at any stage in one’s life but they are usually very rare. Not very many people have more than a few really close friends. Irrespective of the level of intimacy, all friendships are based on reciprocity（相互性）, honesty and a certain amount of love and affection.

53. The second paragraph implies that _____..

　 A. teenagers without friends will suffer from psychological problems

　 B. a widow or a widower will die very soon without companionship

　 C. human beings need companionship and a sense of belonging

　 D. both A and B

54. The degree of intimacy of friendship mainly depends on _____ .

　 A. age 　　　　　　　　　 B. belonging　　　　 C. personality 　　　　　　 D. culture

55. The author thinks that close friends _____ .

　 A. can be easily formed when one is young 　　　　 B. cannot be long-lasting

　 C. are not rare for everyone 　　　　　　　　　　　　　　　 D. are rare for most people

56. The word “irrespective”(Last sentence, Para. 5) means _____ .

　 A. not respecting 　 　B. dishonoring 　　　 C. regardless 　 D. considering