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问题 选择题

除稀有气体外，目前人类已发现的非金属元素共有16种。下列对这16种非金属元素的相关判断正确的是[ ]

①都是主族元素，最外层电子数均大于4 ②单质在反应中都只能作氧化剂，具有强氧化性 ③其中碳、氮形成的氢化物常温下都是气态 ④氧化物都是酸性氧化物

A．①正确

B．只有①③正确

C．只有③正确

D．①②③④均不正确

答案

答案：D

单项选择题

关于农业生产资料增值税的免税规定，下列各项表述正确的是( )。

A．批发和零售化肥、农药免征增值税

B．浓缩饲料不享受免征增值税的优惠

C．生产化肥、农药免征增值税

D．批发和零售农膜免征增值税
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单项选择题

A narrowing of your work interests is implied in almost any transition from a study environment to managerial or professional work. In the humanities and social sciences you will at best reuse only a fraction of the material (1) in three or four years’ study. In most career paths academic knowledge only (2) a background to much more applied decision-making. Even with a " training " form of degree, (3) a few of the procedures or methods (4) in your studies are likely to be continuously relevant in your work. Partly this (5) the greater specialization of most work tasks compared (6) studying. Many graduates are not (7) with the variety involved in (8) from degree study in at least four or five subjects a year to very standardized job (9) . Academic work values (10) inventiveness, originality, and the cultivation of self-realization and self-development. Emphasis is placed (11) generating new ideas and knowledge, assembling (12) information to make a " rational " decision, appreciating basic (13) and theories, and getting involved in fundamental controversies and debates. The humanistic values of higher (14) encourages the feeling of being (15) in a process with a self-developmental rhythm. (16) , even if your employers pursue enlightened personnel development (17) and invest heavily in " human capital " —for example, by rotating graduate trainees to (18) their work experiences—you are still likely to notice and feel (19) about some major restrictions of your (20) and activities compared with a study environment.

（2）（）

A.admits

B.equips

C.states

D.forms
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