一份特别好的英语试题

C. About 325 on-campus undergraduates took online courses in Washington last

year.

D. Different colleges have different policies about online courses.

49. From what Sheila Aaker said in the passage, we can tell _______.

A. business is the most popular major in universities

B. colleges should provide more majors for students

C. where the similarity between business and colleges lies

D. why colleges offer online courses to on-campus students

B

Have you ever wondered why birds sing? Maybe you thought that they were just

happy. After all, you probably sing or whistle when you are happy.

Some scientists believe that birds do sing some of the time just because they are

happy. However, they sing most of the time for a very different reason. Their singing

is actually a warning to other birds to stay out of their territory.

Do you know what a “territory” is? A territory is an area that an animal, usually

the male, claims as its own. Only he and his family are welcome there. No other

families of the same species are welcome. Your yard and house are your territory

where only your family and friends are welcome. If a stranger should enter your

territory and threaten you, you might shout. Probably this would be enough to

frighten him away.

If so, you have actually scared the stranger away without having to fight him. A

bird does the same thing. But he expects an outsider almost any time, especially at

nesting season. So he is screaming all the time, whether he can see an outsider or

not. This screaming is what we call a bird’s song, and it is usually enough to keep an

outsider away.

Birds sing loudest in the spring when they are trying to attract a mate and warn

others not to enter the territory of theirs.

You can see that birds have a language all their own. Most of it has to do with

attracting mates and setting up territories.

50. According to the passage, most of the time birds’ singing is actually A. an expression of happiness B. a way of warning

C. an expression of anger D. a way of greeting

51. What is a bird’s “territory”?

A. A place where families of other species are not accepted.

B. A place where a bird may shout at the top of its voice.

C. An area for which birds fight against each other.

D. An area which a bird considers to be its own.

52. Why do birds keep on singing at nesting season?

A. Because they want to invite more friends.

B. Because their singing helps frighten outsiders away.

C. Because they want to find outsiders around.

D. Because their singing helps get rid of their fears.

53. How does the writer explain birds’ singing?