正确答案: C

促进或延缓的作用

题目：偶然性对事物发展的作用是( )

解析：C【解析】偶然性是指事物联系和发展过程中非必然发生的不确定的趋势，在事物发展过程中处于从属地位，起加速或延缓作用，故选“C”。

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举一反三的答案和解析：

[单选题]强调教师中心，教材中心，课堂中心的代表人物是( )

赫尔巴特

[单选题]胸锁乳突肌 （ ）

止于乳突

[单选题]I expect __________some tough questions from both sides.

there to be

解析：expect后接不定式，there be的不定式形式为there to be，所以选项，B正确。题干意思：我猜想双方都将会遇到很棘手的问题。

[单选题]What do you think of the old woman? She was________．

clever

解析：纵观全文，我们看到老妇人凭借自己的聪明才智战胜了狡猾的医生。

[单选题]下面不成对的颅骨是 （ ）

下颌骨

[单选题]以肌体的外部动作或运动占主导地位的活动，由相应的神经过程所支配的骨骼肌肉运动实现的一系列外显动作称之为( )

动作技能

[单选题]Passage Four

The atmosphere and oceans are not the only parts of the environment being damaged. Rain forests are being quickly destroyed as well, and their survival is questionable. E．O. Wilson, a biologist at Harvard, calls the depletion(枯竭、耗尽)of rain forest areas "the greatest extinction since the end of the age of dinosaurs(恐龙)." Unlike some environmental issues, rain forests' depletion has fortunately received significant public and media's attention. Despite the opposition to the cutting down of rain forests, the problem continues. Every year, Brazil chops down an area of forests the size of the state of Nebraska. In addition to the Amazon's rain forests, many other forests are being cut down as well.: In Indonesia, Zaire, Papua-new Guinea, Malaysia, Burme, the Philippines, Peru, Colombia, Bolivia, and Venezuela, rain forests that were once great have been lost.

all the above

解析：此题为细节题。从文章的第一段可以看到，作者认为现在大气层、海洋和热带雨林都面临毁灭的威胁。

[单选题]根据我国法律的规定，当几种继承之间发生冲突时，按效力的高低排列顺序应是( )。

遗赠扶养协议，遗嘱继承和遗赠，法定继承

解析：D。本题考查对不同遗产移转方式效力的理解。按照《继承法》的有关规定， D正确。

[单选题]有关食物链的说法正确的是( )

一种消费者不能同时取食多种食物