nd are usually areas that resemble parks which are accessible to people.()
there are several benefits of adopting green roof technologies.apart from the obvious psychological and aesthetic(暮学的)benefits of garden—like environments surrounding you，some of the common‘economic and ecological benefits are：a reduction in the consumption of energy;air and water purification;recovering green spaces;and the mitigation(缓解)of the heat island effect in urban areas.
the green roof research that is currently ongoing is focused on evaluating the species of plants that are suitable to be grown on roofs，the methods of propagation(繁殖) as well as establishment，nutrient(养料)and water requirement，substrates，and the quantity and quality of water runoff.the evaluation criteria of plant species are：at what rate they can be established：their capacity to withstand invasive weeds;tolerance of cold and heat;tolerance of drought conditions;capacity of persistence and survival.
a number of experiments are being conducted on roof platform simulations at various research centers.these sites are generally outfitted with equipment，which are used to measure temperatures at different depths of the growing substrates，and the rate and volume of the runoff of stormwaters from each of the platforms.
green roof technology is representative of a completely new market for landscape contractors，and all roofs that currently exist and the future ones to be constructed are the potential market—a market that is too huge to be overlooked.
16. it is estimated that around 10 percent of the flat roofs in germany are green
a．right b．wrong c．not mentioned
17. german people prefer extensive green roof systems to intensive ones
a．right b．wrong c．not mentioned
18. small plants like grasses and herbs are grown widely on intensive green roofs.
a．right b．wrong c．not mentioned
19. green roof is an ecologically sound strategy of spreading green in urban areas
a．right b．wrong c．not mentioned()
20. one of the benefits of green roofs is the reduction of the heat island effect in cities
a．right b．wrong c．not mentioned
21. one focus in the green roof research is the evaluation of suitable plant species
a．right b．wrong c．not mentioned
22. although green roof technology can create a garden—like environment，its potential market is rather small.
a．right b．wrong c．not mentioned 第3部分：概括大意与完成句子(第23～30题，每题1分，共8分)
下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个最佳标题;(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。
the supercomputer network(www．。com)
1 recently ten laboratories run by governments in different parts of the world have become linked.their computers have been connected so they can“talk”to each other. this may not seem very dramatic news，but it is the beginning of a development that will increase the power of the inte
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