单选题

单选题Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which will be counted towards a degree. In many American universities the total work for a degree consists of thirty-six courses, each lasting for one term. A typical course consists of three classes per week for fifteen weeks; a student will probably attend four or five courses during each term while attending a university. Normally a student may expect to take four years attending two semesters each year. Of course, they can work for the degree over a longer period. It is also possible for a student to move between one university and another during his degree course, though this is not in fact done as a regular practice. Every course that the student takes will be given a grade, which is recorded and available for the student to show to their prospective employers. All this imposes a constant pressure and strain of work on students. But some students still spare their time to take part in the student affairs. Elections to positions in student organizations arouse much enthusiasm. The effective work of maintaining discipline is usually performed by students who advise the academic authorities. Any student who is thought to have broken the rules, for example, by cheating, has to appear before a student court. With the large numbers of students, the operation of the system does inelude a certain number of activities. A student who has held one of these positions of authority is much respected and it will be helpful to him later in his career.

单选题Surprisingly, there is a relationship between sea salt and the making of rain drops. Most of the water droplets that make up clouds are formed around small, solid particles. In order to fall as rain, the cloud droplets have to increase in size. Clouds from which rain does not fall have droplets that are fairly uniform in size. Clouds that produce rain have some droplets that are much larger than others. The production of rain depends on the presence of the large droplets that grow in size by coalescence (a fusing together). There is evidence to support the theory that a particle of sea salt serves as the nucleus (核，核心) or center, around which the larger droplets form. Most of the sea salt probably enters the atmosphere from, bubbles that form on the surface of the sea. When the bubbles break, a tiny, even microscopic, droplet of salt water is cast into the air. Once in the atmosphere, the microscopic piece of salt collects water vapor from the air. The water vapor then condenses on the particle of salt. The moisture absorbed by the salt particles, dissolves the salt, thus leaving only a slightly salty cloud droplet. Cloud droplet, formed from condensation of salt particles of dust particles. The reason is that salt particles are usually larger than dust particles. Their larger size is instrumental (有作用的)in making the single rain droplet grow by coalescence with smaller droplets. Since low level clouds don't rise high enough to produce ice crystals as a source of condensation, it most likely is the salt particles that cause them to become rain clouds.

单选题What do you do with your empty cans and bottles? There are two choices, throwing them away or recycling them. Throwing away a metal beverage (饮料) container wastes as much energy as filling a can with gasoline and pouring half out. Besides wasting energy, throwing away bottles and cans causes pollution, increases the volume of solid waste, and uses up natural resources. To control these problems, only nine states have adopted bottle laws. The United States government should require every state to have a bottle law or impose (制定) a national bottle law. To understand how a bottle law can help, you must know how it works. When consumers buy canned or bottled beverages at a store, they pay deposits. This deposit can range from twenty to fifty cents per bottle or can. In order to get this deposit back, the bottles and cans must be returned to supermarkets after they are emptied. The supermarkets then return the bottles and cans to their manufacturers for either reusing or recycling. Bottle laws are currently effective in Oregon, Vermont, Maine, Michigan, Iowa, Connecticut, Delaware, Massachusetts, and New York. These laws work largely because the general public supports them. A recent poll (民意测验) of Americans revealed that 73 percent support bottle laws. This support undoubtedly results from people's concern about pollution and our planet's limited resources.

单选题______ more time, the scientists will be able to work out a good solution to the problem.

单选题Which of the following was not related to urban population growth in the nineteenth century?

单选题You have time tonight, why not go out and have a drink with me? A. For B. Since C. Because D. Even if

单选题______ more attention, the tree could have grown much better than that one.

单选题As the cats' eyes grew ______ the dark, they can catch the rats easily,A) familiar withB) sensitive loC) accustomed toD) use to

单选题To preserve food, the growth of bacteria (细菌) must be controlled. Water, warmth, and food are all needed for bacteria to become strong and healthy. Some kinds of bacteria need air, but other kinds grow only when air is absent. Extremes of temperature, either hot or cold, can kill bacteria. Before electric ice boxes were invented, freezing and cooling were limited by the cold climate. In warmer regions, food was cooled by putting it in the shade, in cold water from the well, or in pits in the ground. Cooking will usually kill bacteria if the temperature is high enough and long enough. Certain methods of cooking remove water, and this aids in preserving food. Drying is the oldest and most common method of preserving food. Food can be dried by the sun, by heat or by combination of the two. Salt was used by many hunting people. When people began to cat vegetables, salt be came a needed part of their life. Salt helps to preserve food because it slows or stops bacteria growth. Other chemicals besides salt are used in preserving foot. Some people oppose the use of chemicals in food. They say that these chemicals may harm people if the chemicals can harm bacteria.

单选题GM offers the Cooperative Education and Intern Programs in order to ______.

单选题Peter worked so fast with the maths problems ______ a lot of mistakes.

单选题Sometimes the biggest problem you have at work is your own stress (压力). To reduce stress at work, you can come early to the workplace and give yourself time to lower your stress level before meetings or telephone calls. Prepare for stressful situations. If all the above fails, find a quiet place to think, read, or calm down. Another way to reduce stress is to set goals that can be achieved. Know your limits and be well-prepared.

单选题

单选题As he keeps himself to himself，he lives a lonely life． A．因为他把自己封闭起来，他过得很孤独。 B．因为他不与人来往，他过得很寂寞。 C．由于他自高自大，人们不与他来往。 D．因为他把自己封锁起来，生活得很孤独。

单选题After the investigation, it was concluded that the nurse was responsible for the surgical accident.

单选题She said she would go and she ______ go.

单选题Their income increased by 21 percent over that of the previous year. A. 他们的收入比前年增加了21%。 B. 仲们的的入增加到前年的21%。 C. 他们的收入比上一年增多到21%。 D. 他们的收入比上一年增长了21%。

单选题______ the result, I would not have asked you to tell me. A. If I know B. Had I known C. I had known D. If I knew

单选题School spirit is a quality that begins early and often lasts a lifetime. A. 学习精神是一种很早开始便养成而最后延续到你一生的素质。 B. 校园精神是一种很早就养成的并常常能持续终生的品质。 C. 学校的目的是为培养学生从开始一直延续到生命最后的一种品格。 D. 学校教育质量常常是在人生的早期就开始而且对一生有关。