阅读理解

　　Washington D.C. is on the east coast (海岸). It is the capital (首都) of America.

　　Washington D.C. is a beautiful city. There are no skyscrapers(摩天大楼) there. The highest building has only sixteen storeys (层), but most of the houses have gardens. When flowers are blooming in spring, the city looks even more beautiful.

　　The city has a population(人口) of 750000. About 70% of the people are black. Many rich people live far away from the city. They drive to the city for work every day. The President(总统) works and lives in the White House. There are a lot of museums (博物馆) there. All of them are free (免费) to visitors. If you get on the top of the Washington Monument (纪念碑), you can get a bird's-eye view of the whole city.

1．Which city is the capital of the United States?

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2．The highest building in Washington D.C. has ________ storeys.

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3．Washington D.C. has about ________ black people.

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4．Where does the U.S. President work?

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A．In the Capital Hill.(美国国会)

B．In the Washington's highest building.

C．In the White House.

5．If you visit the museums in Washington D.C., you ________

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A．needn't pay any money.

B．must pay some money.

C．have to go there early in the morning.