问题 问答题 简答题

生态因子的概念及其分类。

答案

参考答案:

生态因子:是指环境中对生物生长、发育、生殖、行为和分布有直接或间接影响的环境要素。

分类:

1、气候因子(如光、温度、水、空气、雷电等);

2、土壤因子(土壤物理性质、化学性质、肥力、土壤结构和土壤生物等因子);

3、生物因子(指与对象生物发生相互关系的动物、植物、微生物等因子,形成捕食、寄生、竞争和互惠共生等关系);

4、地形因子(海拔高度、坡度、坡向(阴坡和阳坡)、地面起伏等,通过影响气候和土壤,间接地影响植物的生长和分布);

5、人为因子(指对动植物产生影响的人类活动)。

阅读理解

阅读理解。

     Sitting is art that isn't getting passed along People these days feel as though they have to be doing

something If they are not working, they are jogging, or playing tennis or golf, or taking Courses to

improve their minds or bodies -or they are parked in front of the TV. Sitting in front of the TV isn't

sitting-it's watching.

     People used to sit a whole lot. You would walk down the street or drive down the road, and there

they would be, out on the doorsteps, sitting. You could go down to the store and sit on the bench out

front in the Summer or around the fire in the winter. There were sitting benches out in the town square.

At the garage, there were straight-backed chairs. There among the oilcans and tries and spare parts, you

could kick back and sit.

     Houses used to have sitting rooms, where the grown ups would go after Sunday dinner. Mom and

Dad, Grandpa and Aunt Ruby would sit and digest (消化) the fried chicken and talk about Aunt Ethel's

illness, and how well the minister did today. Outside, the children would play, and the afternoon would

pass by in a comfortable haze  (悠闲的氛围).

     That sort of thing looks like doing nothing. A recharging battery (正充电的电池) doesn't look as if

it's doing anything either. Sitting restores your soul. if you want to enjoy a truly full life, don't just do

something-sit there.

1.What message does the author try to get through to us?

A. People should make better use of their sitting room.

B. People should spend less time watching TV.

C. People should pass down their good habits.

D. People should take things easy for their own good.

2. We can learn from the second paragraph that ______.

A. people lived a more restful life in the past

B. towns were built to make living convenient

C. small town garages had a lot to offer 、

D. people enjoyed going out for a drive

3. The sitting room mentioned in the text used to be a place for ______.

A. eating food

B. watching TV

C. gathering together

D. playing with children

4. From the text we know the water believes _____.

A. sitting has a good spiritual effect

B. sitting helps people remember the past

C. sitting room may have different purposes

D. a sitting room is important for the old

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