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[单选题]
高原植物叶肉组织具有丰富的含较多单宁或胶状物质的异细胞，其作用是 ( )
A
形成CO2的储库
B
增加抗寒、抗旱能力
C
有利于增加光的吸收量
D
吸收高原增多的紫外辐射
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试题答案：
D
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下列有关有效积温公式K=N(T-T0)的叙述正确的是（ ）
凡未受人类干扰或扶持，在一定空间和时间范围内，依靠生物和环境本身的自我调节能力来维持相对稳定的生态系统，是__________。
玉米与大豆或花生问作是利用了它们之间原始合作的共生关系。（ ）
成群分布的原因是种子传播方式以母株为扩散中心、动物的群居性和社会行为及
下列哪种方式是生物为适应低温环境而采取的措施（ ）
大气中最多的气体是（ ）
基因和__________是构成生态系统多样性的基础。
随时间的推移，生物群落内一些物种消失，另一些物种侵入，群落组成及其环境向一定方向产生有顺序的发展变化，称为__________。
栖息地的减少和改变，滥捕乱猎和污染是影响生物多样性的主要原因。 ( )
生态系统中必须有的生物成分是生产者和消费者。（ ）
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43．简述岁时节日礼仪对民众生活的伦理规范的意义。
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在抵押物的价值小于债权时，对剩余部分债权，抵押权人（）
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魏晋南北朝时期，南方各政权在蛮族地区建立的一种带有很大程度内部自治性质的地方行政体制。这种特殊行政区称为( )
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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)24.1When 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
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