问题 单项选择题 案例分析题

生态学家为了监测和预报该生态系统鼠害的发生情况,对弃耕后田鼠种群数量的变化规律进行了研究。

下列关于群落演替的叙述不正确的是()

A.演替是群落的根本性质发生变化的现象

B.演替过程只要不遭到人类的破坏和各种自然力的干扰,其总趋势是物种多样性的增加

C.只有群落的结构受到干扰或破坏时,才会出现群落的演替

D.不论是成型的群落或是正在发展形成过程中的群落,演替现象一直存在着,并贯穿着整个群落发展的始终

答案

参考答案:C

阅读理解

Directions: Read the following passage. Complete the diagram by using the information from the passage.

Write NO MORE THAN THREE WORDS for each answer.

     They say a country's cuisine is a reflection of its culture. The UK has always been a diverse country,

since every region has its own traditional foods. For example, Scottish cuisine is famous for its haggis (肉

馅羊肚), Aberdeen Angus beef, shortbread and whisky. Wales is well-known for its lamb and leeks (韭菜).

     There are also dishes common to the whole UK as well. Almost everyone likes a full English breakfast

(fried eggs, bacon, sausage, baked beans, fried mushrooms and fried tomatoes) in the morning. Then there

is the Sunday roast (a roasted joint of meat, with roast potatoes, vegetables and gravy for lunch.)

     With such a range of foods, why then did British cuisine have a bad international reputation for about 50

years (1950-2000)? One reason is that during and after World War 11, cooks in the UK were limited by the

ingredients they had to work with and therefore lost some of their traditional skills. Another is that British

food tends to be "heavy" because of the colder climate-Britons need big meals to keep the body warm.

     Yet British cuisine has had a better reputation for tile last decade or so. One reason is that the wide range

of ethnic groups in the UK has given British cuisine new ingredients, flavors, "fusion (融合)" and techniques.

Sandwiches used to be the most popular. Curry, originally an Asian dish, is now the most popular food in

the UK.

     Another reason for the improvement is climate change. The UK is much warmer now than 10 years ago.

Today, farmers can grow new herbs like coriander, to meet the demands of increased curry sales. In addition,

there has been a boom in growing garlic in Scotland.

     One last reason is the large number of cookery programs on British television. British people are more

educated about food than ever before.

     So what are the results? In 2009, British restaurants received more Michelin stars than in any other

previous year. The Michelin Guide (first established in France) sets the international standard for restaurant

cuisine. With so much good food to eat, perhaps it is not surprising that the UK now has an obesity problem.

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