In American high schools, there is a tradition for each year's graduating class( called the seniors) to play a joke on the school—the Senior Prank(毕业恶作剧）.
This usually happens at the end of the school year just before the seniors graduate from the school. It is an unofficial tradition. Al-though the schools don't encourage it, each year the seniors try to make their pranks the most original so that their class will be remembered in the years to come. The joke is supposed to be light-hearted(无伤大雅的）and must not do major damage to the school  property .
The best prank at my high school was done several years ago. A flower called the golden poppy(金罂粟花）is the state flower of California ； the state law states that no one can cut them down once they are planted.
The seniors at my school took advantage of the law. They planted golden poppies all over the football field one night, spelling out their graduation year with the flowers ！ Since the school couldn't break the law to cut down the poppies, they had to wait until the flowers died.
The greatest prank that I've ever heard was done by one of my history teachers when he was in high school. He and some of his close friends went fishing in hopes of catching big fish for their prank. They were lucky and caught a three-foot shark.
My teacher and his friends took the shark to the school at night and dumped it into the swimming pool. The next morning when students went swimming, they found a dead shark in their pool. The chlorine(氯）in the water had killed the shark ！ My history teacher always regretted that his school had put so much chlorine in the pool, or it would have been more fun if the shark was still alive the next day.
The schools won't take it seriously if the pranks don't cause too much damage. But, sometimes the school will punish the seniors for going too far with their prank. My teacher's “Shark Prank “is an example of a prank gone too far. The school had to drain (排水）the pool and have it cleaned before filling it up again, which had cost the school several thousand dollars.
The underlined word “property “means _________.

A．资产

B．性质

C．道具

D．所有权

The author implies (暗示）_________.

A．the schools encourage the seniors to play the prank

B．his history teacher was punished by the school

C．the law of California doesn't allow planting the golden poppy in the campus

D．after finding a shark in the swimming pool, the school killed it with the chlorine

We can infer(推断）from the passage that _________.

A．the “Golden Poppy Prank “is successful and well-meaning

B．the Senior Prank is an unofficial tradition

C．the school had to cut down the golden poppies at last

D．the golden poppy is the state flower of California

Which of the following is not mentioned in the passage?

A．Only the graduating class can play the Senior Prank.

B．The schools don't encourage the Senior Prank.

C．The “Golden Poppy Prank " cost the school a lot of money.

D．The “Shark Prank “is beyond the general pranks.

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