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问题 选择题

右图是某化学反应前后各种物质的微粒示意图，图中“○”“●”表示不同元素的原子。根据图示推断，该反应属于

 

A．化合反应

B．分解反应

C．置换反应

D．复分解反应

答案

答案：A

题目分析：由题意可知，该反应是两种单质反应，生成了一种化合物，这是化合反应。选A。

点评：多种物质反应，生成一种物质的反应属于化合反应。

近几年我国进行“退耕还林”、“退耕还草”行动，而在建国初期却不是这样的，你的依据是（   ）

A．《土地改革法》

B．《中华人民共和国宪法》

C．中共八大

D．第一次全国人民代表大会
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单项选择题

People are indulging in an illusion whenever they find themselves explaining at a cocktail(鸡尾酒)party，say, that the are “in computers，”or“ in telecommunications，”or “in electronic funds transfer”. The implication is that they are part of the high-tech world. Just between us，they usually aren’t. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are （71）of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working group（紧密联系在一起的工作小组），we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort，and our failures stem from poor human interactions.

The main reason we tend to focus on the（72）rather than the human side of work is not because it’s more (73)，but because it’s easier to do. Getting the new disk drive installed is positively trivial compared to figurine out why Horace is in a blue funk(恐惧）or why Susan is dissatisfied with the company aver only a few months. Human interactions are complicated and never very crisp（干脆的，干净利落的）and clean in　their effects, but they matter more than any other aspect of the work. If you find yourself concentrating on the（74）rather than the（75）．you’re like the vaudeville character （杂耍人物）who loses his Keys on a dark street and looks for them on the adjacent street because，as he explains，“The light is better there!”

（75）处填（）。

A．technology　

B．sociology　

C．physiology　

D．astronomy
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