题目内容：

"Where is the university(大学)?"This is a question that many visitors to Cambridge ask. But no one can give them an exact answer, for there is no wall to be found around the university. The university is the city. You can find classroom buildings, libraries , museums and offices of the university all over the city. And most of its members are the students and teachers of the thirty-one colleges. 

Cambridge was already a town long before the first students and teachers arrived 800 years ago. It grew up by the river Cranta, and the river was once called the Cam. A bridge was built over the river as early as 875. So the town got its name "Cambridge".

In the 14th  and 15th  centuries more and more land was for college buildings. The town grew much faster in the 19th  century after the opening of the railway in 1845. Cambridge became a city in 1951 and now it has a population of over 100, 000. Many young students in other countries expect to study at Cambridge. A large number of people from all over the world come to visit the university. It has become a famous place all around the world.

1.According to the passage, Cambridge University is made up of  _______  colleges.

A. 31 B. 15 C. 875 D. 800

2.The town got its name from  _______ .

A. the first students and teachers.

B. the bridge built over the river Cam.

C. the members of the university.

D. the person who designed the bridge.

3.From the passage, we know that  _______.

A. the town grew much faster before 875.

B. the city has a population of 100,000 in 1951.

C. many young students dream of studying at Cambridge University.

D. the Cambridge University has a history of more than 1,000 years.