题型:阅读理解 题类:常考题 难易度:普通
江苏省南通中学2016-2017学年高二上学期英语10月月考试卷
Mountaineers have noted that as they climb, for example, up to the 12,633foot Humphreys Peak in Arizona, plant life changes greatly. In the Sonoran Desert, one climbs into a pine forest at 7,000 feet and a treeless tundra(冻土带) on the top of the mountain. It may seem that plants at a given altitude are associated in what can be called “communities” -groupings of species. The idea is that over time, plants that require particular climate and soil conditions come to live in the same places, and are frequently to be found together. Scientists study the history of plant life and build up a picture of how groups of plants have responded to climate changes and how ecosystems develop. But are these associations, which are real in the present, permanent?
A great natural experiment took place on this planet between 25,000 and 10,000 years ago, when small changes in the earth's orbit caused great sheets of ice to spread from poles. These glaciers(冰川) covered much of North America and Europe to depths of up to two miles, and then, as the climate warmed, they retreated. During this retreat, they left behind newly uncovered land for living things to occupy, and as those living things moved in they laid down a record we can read now. As the ice retreated and plants started to grow near a lake, they release pollen(花粉). Some would fall into the lake, sink to the bottom and mix with the sand. By drilling into the lake bottom it is possible to read the record of the plant life around the lake. The fossil record seems clear; there is little or no evidence that entire groups of plants moved north together. Things that lived together in the past don't live together now, and things that live together now didn't live together in the past. Each individual living things moved at its own pace. The fossil record seems to be telling us that we should be thinking about preserving species by giving them room to move about-to respond to environmental changes.
Welcome to the 2012 London Olympic Games | |
Badminton | This sport was invented by British soldiers in India who called it Poono, the same name as the town in which they lived. It was first played at the Olympics in 1992 at Barcelona. Although the rules of the modern sport were developed in England, Asian countries are now the best. |
Football | There are two medal competitions for Olympic football, one for men's teams and one for women's. Football was first played at the 1908 Olympic Games and it has been played at every Olympic Games ever since, except for Los Angeles 1932. |
Archery | Archery has a 10,000-year history, when bows and arrows were first used in hunting and war. Archery first appeared at the Paris Olympics of 1990. |
Taekwondo | This Taekwondo sport's name means “the way of the hand and foot”. The players get points by hitting each other with these two parts of the body only. The players mustn't lie on the floor and no equipment can be used taekwondo first appeared at the 2000 Sydney Games. |
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