问题 问答题 简答题

特定时间和特定年龄生命表有何区别?

答案

参考答案:

特定时间生命表的制作要求以相等的时间间距,调查记录在各个时刻种群的存活数量和繁殖数量。从特定时间生命表可以计算初阿訇群在特定时间内的死亡率和出生率,还可以获得种群的内禀自然增长率和局限增长率,但不能分析环境因子对种群动态的影响;

特定年龄生命表是按照动物的年龄或发育阶段顺序、系统地记载种群的死亡原因和死亡数量而整理成的生命表。特定年龄生命表能分析出影响种群数量变动的重要因子和关键因子,因此在害虫综合治理的研究中具有重要的意义,在昆虫研究中应用更为广泛。

阅读理解

阅读理解。

     Switzerland (瑞士) is famous for its watches. However, this country didn't invent the watch. It was the

British who did. Here is a story of how the watch was brought to Switzerland.

     Many years ago, an Englishman traveled to Italy. This Englishman traveled in a Carriage. On his way, he

stopped in a small town called Geneva in Switzerland.

     There was a carriage clock in it. This was the earliest kind of watch. A blacksmith's assistant happened

to see the clock. He wanted to know what it was and asked the English man about it. "It is a carriage clock."

said the man. "This machine can tell the time but it isn't working now."

     The blacksmith's assistant wanted to try to repair, so the traveler handed him the clock. The assistant was

a very clever man, so it was easy for him to repair it. He even remembered how it was made. As soon as the

traveler had gone on his way, he made a watch of exactly the same type (样式).

     So the watch-making was started in Switzerland. Today, Swiss watches are sold in countries all over the

world.

1. What is Switzerland famous for?

A. TVs.

B. Pens.

C. Watches.

D. Shoes.

2. What can the carriage clock tell?

A. A story.

B. A joke.

C. The time.

D. A lie.

3. Which of the following is true?

A. The blacksmith's assistant didn't want to have a look.

B. The blacksmith's assistant wanted to wear the clock.

C. The blacksmith's assistant wanted to repair the clock for the man.

D. The blacksmith's assistant repaired the carriage.

4. From the passage, we know that _____.

A. Japan started the watch-making.

B. Swiss watches are sold only in Switzerland.

C. The English traveler was the inventor of the watches.

D. Swiss watches are sold all over the world.

阅读理解