2014年5月托福考试模拟试题及答案(第五套)_第8页

21.The thirteen stripes of the United States flag represent the original thirteen states of the Union, which

　　A B C

　　they all were once colonies of Britain.

　　D

　　22. In 1860, more as 90 percent of the people of Indiana lived rural areas, with only a few cities having a

　　A B C

　　population exceeding 10,000.

　　D

　　23.Gravitation keeps the Moon in orbit around Earth and the planets other of the solar system in orbit

　　A B C D

　　around the Sun.

　　24. Photograph was revolutionized in 1831 by the introduction of the collodion process for making glass

　　A B C D

　　negatives.

　　25. After flax is washed, dry, beaten, and combed, fibers are obtained for use in making fabric.

　　A B C D

　　26. A fever is caused which blood cells release proteins called pyrogens, raising the body’s temperature.

　　A B C D

　　27. Because of various gift-giving holidays, most stores clothing in the United Sates do almost as much

　　A B

　　business in November and December as they do in the other ten months combined.

　　C D

　　28.The United States National Labor Relations Board is authorized to investigation allegations of unfair

　　A B

　　labor practices on the part of either employers or employees.

　　C D

　　29.The Great Potato Famine in Ireland in the 1840’s caused an unprecedented numbers of people from

　　A B C

　　Ireland to immigrate to the United States.

　　D

　　30.The particles comprising a given cloud are continually changing, as new ones are added while others

　　A B

　　are taking away by moving air.

　　C D