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问题 选择题

一个生态系统中往往有很多条食物链。下列食物链的表示方法正确的是

A．草←兔←狼

B．草→兔→狼

C．阳光→草→兔→狼

D．兔→草→狼

答案

答案：B

题目分析：由食物链的定义可以知道：食物链的起点是生产者，终点是消费者，中间用箭头来表示，箭头指向吃的一方，而且它们之间存在吃与被吃的逻辑关系，可以判断：

A、起点是草，属于生产者，终点是狼，属于消费者，而且它们之间存在吃与被吃的逻辑关系，所以是正确选项．

B、符合食物链的定义，但其箭头方向指反了，应指向吃的一方，所以为错误项．

C、食物链的起点是阳光，属于生态系统的非生物部分，不是生产者，所以为错误项．

D、食物链的起点是兔，属于消费者，不是生产者，所以为错误项．

多项选择题

小王最近离开了武汉一家电脑公司，而去了深圳一家电脑公司，原因是他对原公司每月付给他的薪酬感到不公平。

小王的离职表明( )。

A．薪酬方案对于员工的工作态度影响很小

B．薪酬方案对于员工的工作行为有很大影响

C．公平合理的薪酬方案能够鼓励员工提高生产率

D．不公平的薪酬方案会损害组织的整体利益
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单项选择题

　Several men have been responsible for promoting forestry as a profession. Foremost was Gifford Pinchot, the father of the professional forestry in America. He was chief of the Forest Service from 1898 until 1910, working with President Theodore Roosevelt to instigate sound conservation practices in forests. Later he was professor of forestry and founder of the Pinchot School of Forestry at Yale University. Another great forester was Dr. Bernard E. Fernow, the first head of the U.S. Forest Service. He organized the first American school of professional forestry at Cornell University.　　The foresters of today, like Pinchot and Fernow in the past, plan and supervise the growth, protection, and utilization of trees. They make maps of forest areas, estimate the amount of standing timber and future growth, and manage timber sales. They also protect the trees from fire, harmful insects, and disease. Some foresters may be responsible for other duties, ranging from wildlife protection and watershed management to the development and supervision of camps, parks, and grazing lands. Others do research, provide information to forest owners and to the general public, and teach in colleges and universities.

Why does the author compare Pinchot and Fernow to the foresters of today

A．To describe different philosophies of forestry management

B．To show how the field of forestry has changed in 100 years

C．To argue for the expansion of university forestry programs

D．To introduce the type of work done by professional foresters
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