问题 单项选择题

在四川的一些沼泽地中,剧毒的链蛇和一些无毒蛇一样,在蛇皮表面都有红白黑相间的鲜艳花纹。而就在离沼泽地不远的干燥地带,链蛇的花纹中没有了红色;奇怪的是,这些地区的无毒蛇的花纹中同样没有了红色。对这种现象的一个解释是,在上述沼泽和干燥地带中,无毒蛇为了保护自己,在进化过程中逐步变异为和链蛇具有相似的体表花纹。
以下哪项最可能是上述解释所假设的( )

A.毒蛇比无毒蛇更容易受到攻击

B.在干燥地区,红色是自然界中的一种常见色,动物体表的红色较不容易被发现

C.链蛇体表的颜色对其捕食的对象有很强的威慑作用

D.以蛇为食物的捕猎者尽量避免捕捉剧毒的链蛇,以免在食用时发生危险

答案

参考答案:D

判断题
阅读理解

Every people(民族)uses its own special(特殊的)words to show its ideas and feelings. Some expressions are commonly used for many years. Others are popular for just a short time. One such American expression is“Where’s the beef?”It is used when something is not as good as it is said to be In the early 1980s “Where’s the beef?”was one of the most popular expressions in the United States. It seemed as if everyone was using it at the time.

Beef, of course,is the meat form a cow, and no food is more popular in America than a hamburger(汉堡包)made from beef. In the 1960s a businessman named Ray Kroc began building small restaurants that sold hamburgers at a low price. Kroc called his restaurants“McDonald’ s”.Ray Kroc became one of the richest businessmen in America.

Other business people watched his success. Some of them opened their own hamburger restaurants. One company(公司)called“Wendy’s”said its hamburgers were bigger than those sold by McDonald’s or anyone else’s .The Wendy’s Company began to use the expression“Where’s the beef?”to make people know that Wendy’s hamburgers were the biggest. The Wendy’s television advertisement(广告)showed three old women eating hamburgers. The bread that covered the meat was very big, but inside there was only a bit of meat. One of the women said she would not eat a hamburger with such a little piece of beef.“Where’s the beef?”she shouted in a funny way. The advertisement for Wendy’s hamburger restaurants was a success .As we said, it seemed everyone began using the expression“Where’s the beef?”

53._______started Mc Donald’s restaurant.

A.Ray Kroc  B.McDonald     C.Wendy      D.Three old women

54.Other people wanted to open hamburger restaurants because they thought_______.

A.they could sell hamburgers at a low price  B.hamburgers were easy to make

C.beef was very popular in America        D.they could make a lot of money

55.Wendy’s made the expression known to everybody_______.

A.with many old women eating hamburgers

B.by a television advertisement

C.while selling bread with a bit of meat in it

D.at the McDonald’s restaurant

56.We can learn from the passage that the expression“Where’s the beef?”means_______.

A.the beef in hamburgers is not as much as it is said to be

B.the hamburgers are not as good as they are said to be

C.something is not so good as one says     

D.Wendy’s is the biggest