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【B4】
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听力原文： 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 he may count towards a degree. In many American universities, the total work for a degree consists of thirty-six courses. A typical course consists of three classes per week for fifteen weeks; while attending a university a student will probably attend four or five courses during each semester. Normally a student would expect to take four years attending two semesters each year. It is possible to spread the period of 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.
For every course that he follows, a student is given a grade, which is recorded, and the record is available for the student to show to prospective employers. All this imposes a constant pressure and strain of work, but in spite of this, some students still find time for great activity in 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 enormous number of students, the operation of the system does involve a certain amount of activity. A student who has held one of these positions of authority is much respected and it will be of benefit to him later in his career.
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Unfortunately many young people have to make career plans【B8】benefit of help from a(n)【B9】vocational counselor or psychologist. Knowing【B10】about the occupational world, or themselves for that matter, they choose their lifework on a hit-or-miss basis. Some【B11】from job to job. Others【B12】to work in which they are unhappy and for which they are not fitted.
One common mistake is choosing an occupation for【B13】real or imagined prestige. Too many high-school students—or their parents for them—choose the professional field,【B14】both the relatively small proportion of workers in the professions and the extremely high educational and personal【B15】. The imagined or real prestige of a profession or a white-collar job is no good【B16】for choosing it as life's work.【B17】, these occupations are not always well paid, since a large【B18】of jobs are in mechanical and manual work, the【B19】of young people should give serious【B20】to these fields.
【B1】
一矩形钢筋混凝土梁截面尺寸为250× 500mm，单排受刀钢筋配有4-25，浇注该梁混凝土石子的最大粒径为()。
第一节 单项填空
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
White surfaces reflect heat and light ______ black ones absorb them.
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