题目内容：

In most people's opinion, the tiger is not an animal that we would ordinarily think of as being chicken. However, one tiger, which lives in an English zoo, turned out to be more cowardly（胆小的）than his keepers could ever have imagined.

Tanvir, a two-year-old Bengal tiger, got stuck at the top of a new 5m-high activity tower in the zoo, after climbing it for the first time.

The wooden tower had been designed to provide mental exercise for Tanvir by testing his ability of dealing with troublesome situations, but after climbing it in just a few seconds, he lost his courage when it came to coming back down. Tanvir went on to spend nearly two days at the top of the tower trying to collect the courage to attempt to get down.

A spokesperson for the zoo said that several days before Tanvir had taken half an hour to get down a lower tower only 1.5m high, and the taller tower had clearly been too much challenging for him.

"Every time he got to the edge, he looked out, put a paw over, and thought, ‘no, I cannot make it!" ’laughed Samantha Cordrey, Tanvir's keeper. In the end Tanvir's hunger defeated his fear, and after almost 48 hours he made his way down. Burying himself in a big meal just like a hungry pig, Tanvir seemed to forget such a shameful experience for a while.

It appears that his experience would not be the worst in Tanvir's life if he continued to act like a chicken. It is not known whether he will take courage to go back up his exercise tower again.

The whole episode（插曲）only serves to show the difficulties faced by zoo staff in creating environments that will improve animals' living ability in enclosed space.

1.When speaking of Tanvir's shameful experience, Samantha Cordrey might feel it was      .

A. funny    B. surprising    C. exciting    D. unbelievable

2.What made Tanvir get down the 5m-high activity tower at last?

A. The coldness of the weather.    B. The direction from his keepers.

C. The sufferings of being hungry.    D. The fear of being alone.

3.Why does the author say "this experience would not be the worst in Tanvir's life if..."(Paragraph 6)?

A. Because Tanvir's keepers will design more difficult exercise for him.

B. Because Tanvir is so cowardly that he has little courage to meet greater challenges.

C. Because Tanvir's bad health will bring him much trouble in practice.

D. Because Tanvir is always careless and often causes trouble by accident.

4.The zoo designed the 5m-high activity tower to      .

A. make Tanvir become brave    B. improve Tanvir's performance skills

C. let tourists watch Tanvir better    D. improve Tanvir's living ability