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生态农业与传统农业不同,其主要特点是:整体性、层次性、地域性、调控性和__________。
地形是通过改变其他生态因子而对生物产生影响的,所以地形称为__________生态因子。
氧气对水生动物来说,属于( )
经验证明,要使一个国家或地区的生态环境比较优越,其森林覆盖率要达到( )
生态系统中,能量从太阳能到化学能、物质从无机物到有机物的同化过程为 ( )
生产力和生物量最大的生态系统类型是( )
关于群落概念的叙述,下列不正确的是 ( )
生物群落对其周围环境产生重大影响,并形成__________。
可持续发展包括两层含义,一是人类要发展,要满足人类的发展要求,二是不能损害自然界支持__________的生存能力。
认为群落是客观存在的实体,是一个有组织的生物系统,像有机体与种群那样,这种群落性质观点是 。
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The grey building is the place where the workers live, the white building is the place where the spare parts _____.
2.
25、可能威胁独立性的情形包括【 】
3.
为冲突情境中的各方提供总体的行为指南的是
4.
24.Cars are an important part of life in th United States.Without a car, most people feel that they are poor.An even if a person is poor he doesn't feel really poor when he has a car.Henry Ford was the man who first started making cars in large numbers.He probably didn't know how much the car was going to affect American culture.The car made the Unite States a nation on wheels.And it helped make the United States what it is today.There are three main reasons the car became so popular in the United States.First of all,the country is a huge one and Americans like to move around in it.The car provides the most comfortable and cheapest form of transportation.With a car people can go any place without spending a lot of money.The second reason cars are popular is the fact that the United States never really developed an efficient and inexpensive form of public transportation.Long-distance have never been as common in the United States as they are in other parts of the world.Nowadays,there is a good system of air-service provided by planes.But it is too expensive to be used frequently.The third reason is the most important one,though.The American spirit of independence is what really made cars popular.Americans don't like to wait for a bus or a train or even a plane.They don't like to have to follow an exact schedule.A car gives them the freedom to schedule their own time.And this is the freedom that Americans want most to have.The gas shortage has caused a big problem for Americans.But the answer will not be a bigger system of public transportation.The real solution will have to be a new kind of car,one that does not use so much gas.(10分)24.1 When do most Americans feel they are poor?(2分)A. When they don't have a carB. When they live in a huge countryC. When they don't planes.D. When they have a car
5.
The English Civil War is generally regarded as the beginning of modern _____ history.A. European B. ScottishC. Welsh D. world
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