Passage One
Questions 21 to 25 are based on the following passage. 
    Dogs are social animals and without proper training, they will behave like wild animals. They will spboil your house, destroy your belongings, bark excessively,fight other dogs and even bite you. Nearly all behavior problems are perfectly normal dog activities that occur at the wrong time or place or are directed at the wrong thing. The key to preventing or treating behavior problems us learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting.
    One of the best things you can do for your dog and yourself is to obedience train (驯服) it. Obedience training doesn't solve all behavior problems, but it is the foundation for solving just about any problem.Training opens up a line of communication between you and your dog. Effective communication is necessary to instruct your dog about what you want it to do.
    Training is also an easy way to establish the social rank order. When your dog o
beys a simple request of "come here, sit," it is showing obedience and respect for you. It is not necessary to establish yourself as top dog or leader of the dog pack (群) by using extreme measures. You can teach your dog its subordinate (从属的)role by teaching it to show submission to you. Most dogs love performing tricks for you to pleasantly accept that you are in charge.
    Training should be fun and rewarding for you and your dog.It can enrich your relationship and make living together more enjoyable. A well |trained dog is more confident and can more safely be allowed a greater amount of freedom than an untrained animal.
21. Behavior problems of dogs are believed to _______.
    A) be just part of their nature     B) worsen in modern society
    C) occure when they go wild         D) present a threat to the community
22. The primary purpose of obedience training is to _______.
    A) teach the dog to perform clever tricks
    B) make the dog aware fo its owner's authority
    C) provide the dog with outlets for its wild behavior
    D) enable the dog to regain its normal behavior
23. Effective communication between a dog and its owner is _______.
    A) essential to solving the dog's behavior problems
    B) the foundation for dogs to perform tasks
    C) a good way to teach the dog new tricks
    D) an extreme measure in obedience training
24. Why do pet dogs love performing tricks for their masters?
    A) To avoid being punished.         B) To show their affection for their masters.
    C) To win leadership of the dog pack. D) To show their willingness to obey.
25. When a dog has received effective obedience training, its owner _______.
    A) can give the dog more rewards    B) will enjoy a better family life
    C) can give the dog more freedom    D) will have more confidence in himself

Passage Two
Questions 26 to 30 are based on the following passage.
    Engineering students are supposed to be examples of practicality and rationality
, but when it comes to my college education I am an idealist and a fool. In highschool I wanted to be an electrical engineer and, of course, any sensible student with my aims would have chosen a college with a large engineering department,famous reputation and lots of good labs and research equipment. But that's not what I did.
    I chose to study engineering at a small liberal |arts(文科) university that doesn't even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren't studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them.
    I headed off to college sure I was going to have an advantage over those students who went to big engineerng "factories" where they didn't care if you had values or were flexible. I was going to be a complete engineer: technical genius and sensitive humanist(人文学者) all in one.
    Now I'm not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile (协调) engineering with liberal |arts courses in college.
    The reality that has blocked my path to become the typical successful student is
that engineering and the liberal arts simply don't mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult.
26. The author chose to study engineering at a small liberal-arts university because 
    he _______.
    A) wanted to be an example of practicality and rationality 
    B) intended to be a combination of engineer and humanist
    C) wanted to coordinate engineering with liberal-arts courses in college
    D) intended to be a sensible student with noble ideals
27. According to the author, by interacting with people who study liberal arts, 
    engineering students can _______.
    A) balance engineering and the liberal arts 
    B) receive guidance in their careers
    C) become noble idealists 
    D) broaden their horizons
28. In the eyes of the author, a successful engineering student is expected _______.
    A) to have an excellent academic record
    B) to be wise and mature
    C) to be imaginative with a value system to guide him
    D) to be a technical genius with a wide vision
29. The author's experience shows that he was _______.
    A) creative      B) ambitious         C) unrealistic    D) irrational
30. The word "they" in "... together they threaten to confuse." (Line 3, Para. 5) 
    refers to _______.
    A) engineering and the liberal arts     B) reality and noble ideals
    C) flexibility and a value system       D) practicality and rationality

Passage Three
Questions 31 to 35 are based on the following passage. 
    Priscilla Ouchida's "energy |efficient" house turned out to be a horrible dream. When she and her engineer husband married a few years ago, they built a $100,000, three -bedroom home in California. Tightly sealed to prevent air leaks,the house was equipped with small double |paned(双层玻璃的) windows and several other energy |saving features. Problems began as soon as the couple moved in, however. Priscilla's eyes burned. Her throat was constantly dry. She suffered from headaches and could hardly sleep. It was as though she had suddenly developed a strange illness.
    Experts finally traced the cause of her illness. The leyel of of formaldehyde(甲醛) gas in her kitchen was twice the maximum allowed by federal standards for chemical workers. The source of the gas? Her new kitchen cabinets and wall |to |wall carpeting.
The Ouchidas are victims of indoor air pollution, which is not given sufficient attention partly because of the nation's drive to save energy. The problem itself isn't new. "The indoor environment was dirty long before energy conservation came along," says Moschandreas, a pollution scientist at Geomet Technologies in Maryland. "Energy conservation has tended to accentuate the situation in some cases."
    The problem appears to be more troublesome in newly constructed homes rather than old ones. Back in the days when energy was cheap, home builders didn't worry much about unsealed cracks. Because of such leaks, the air in an average home was replaced by fresh outdoor air about once an hour. As a result, the pollutants generated in most households seldom built up to dangerous levels.
31. It can be learned from the passage that the Ouchidas' house_______.
    A) is well worth the money spent on its construction
    B) is almost faultless from the point of energy conservation
    C) failed to meet energy conservation standards
    D) was designed and constructed in a scientific way
32. What made the Ouchidas' new house

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