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发布时间：2006-06-21 21:07     点击：

(b) it is heavier on one side than the other

(c) it is unable to protect itself from meteorite attacks

(d) it has less effect upon the tides than the Sun

21. Which of the following can be inferred from the passage?

(a) the Moon is not able to support human life

(b) if the Moon had no gravitational influence, the Earth would not have tides

(c) people living in Hawaii and Arizona would feel at home on the Moon

(d) Mars could have been formed in a similar way to the Moon

Questions 22-31

People of Hispanic origin were on the North American continent centuries before settlers arrived from Europe in the early 1600s and the thirteen colonies joined together to form the United States in the late 1700s. The first census of the new nation was conducted in 1790, and counted about four million people, most of whom were white. Of the white citizens, more than 80% traced their ancestry back to England. There were close to 700,000 slaves and about 60,000 “free Negroes”. Only a few Native American Indians who paid taxes were included in the census count, but the total Native American population was probably about one million.

By 1815, the population of the United States was 8.4 million. Over the next 100 years, the country took in about 35 million immigrants, with the greatest numbers coming in the late 1800s and early 1900s. In 1882, 40,000 Chinese arrived, and between 1900 and 1907, there were more than 30,000 Japanese immigrants. But by far, the largest numbers of the new immigrants were from central, eastern, and southern Europe.

22. Why did the author write the passage?

(a) to outline the ways immigration has been restricted r>(b) to emphasize the impact of migrants from Europe

(c) to explain and give examples of the concept of a “melting pot”

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