【正文】 s light travels(A) through solid objects in space(B) in many different directions(C) more slowly than scientists previously believed(D) further in summer than in winterPassage 4 Here in the United States, before agricultural activities destroyed the natural balance, there were great migrations of Rocky Mountain locusts (Melanoplus spretus). Great migrating hordes of these insects once darkened the skies on the plains east of the Rockies where crops were often destroyed。 s light and heat is emitted in such directions that, after passing unhindered through interplanetarv, space, It hits the Earth.1. What does the passage mainly discuss?(A) the production of solar light and heat(B) the physical and chemical nature of life(C) The conversion of hydrogen to helium (D)Radiation in the xray part of the spectrum2. According to the passage, energy is released in the Sun when(A) helium atoms bind with each other(B) gamma radiation escapes from the spectrum(C) radiation is absorbed by helium(D) nuclei of hydrogen atoms collide3. The passage indicates that, in parison to radio waves, gamma waves(A) produce louder sound (B) are less magnetic(C) do not form in the Sun39。s very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium. and, in doing so. release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of years. The nuclear energy is released at the Sun39。 s War of Independence heralded the birth of three modern nations. One was Canada. which received its first large influx of English speaking population from the thousands of loyalists who fled there from the United States. Another was Australia. which became a penal colony now that America was no longer available for prisoners and debtors. The third newerthe United Statesbased itself squarely on republican principles. Yet even he political overturn was not so revolutionary as one might suppose. In some states. notably Connecticut and Rhode island. the war largely ratified a colonial self rule already existing. British officials, everywhere ousted, were replaced by a home grown governing class which promptly sought a local substitute for king and Parliament.1. Which of the following would be the best title for the passage?(A) the United States: An Isolated Community(B) Breathtaking Events During the American Revolution(C) Canada and the American War of independence(D) The American Revolution: Evolution Not Revolution 2. In the first paragraph. what does the author suggest about the French and Russian revolutions?(A) they were explosive and abrupt. (B) they were ineffective(C) They involved only those people living in urban areas.(D)They led to release of all political prisoners. 3. In lines 56, what does the author mean by people went on working and praying, marrying and playing(A)More people got married than divorced.(B) The war created new jobs.(C) Life went on as usual. (D) People had more than enough leisure time. the second paragraph, the author states that the colonies39。 then the drum skin was tightly strapped over the circle with rawhide laces. While some Plains Indian drums had a single drum skin, as a tambourine has, there were others, such as the drums of the Ute that had skins lashed onto both sides.The whistle and flute were the only Plains Indian wind instruments. Whistles were made from the wing bone of an eagle. the bird that symbolized courage. The recorderlike flutes, with finger holes along the top, were carved from a length of soft, straight grained wood, like willow or box elder. that was split in half and hollowed out。s to resist the policies of George Washington39。s motion in relation to the A B Cforces acting it. D31. In the United States, both the federal and state governments have laws designed to guard A Bconsumers against deceptive advertise. C D32. Gore Vidal has steadily pursue a literary career remarkable for its productivity, versatility, A B Cand unpredictability. D33. When overall exports exceed imports, a country said to have a trade surplus. A B C D34. Instructors at the school of American Ballet first examine a young applicant39。s expectations for a higher standard of living increase __________.(A) conditions in their munity improve(B) since conditions in their improving munity(C) conditions improve in their munity(D) as conditions in their munity improve11. Essentially, a theory is an abstract, symbolic representation of __________reality.(A) what it is conceived(B) that is conceived(C) what is conceived to be(D) that is being conceived of12. All of the plants now raised on farms have been developed from plants __________wild.(A) once they grew(B) they grew once(C) that once grew(D) once grew13. __________relatively costly, the diesel engine is highly efficient and needs servicing infrequently.(A) Even(B) It is(C) Even though(D) There is14. __________images out of clay, stone, and metal.(A) The shaping of sculpture(B) Sculpting the shapes(C) To shape sculpture(D) Sculptors shape15. __________dates from the end of the eighteenth century.(A) The modern circus(B) That the modern circus(C) While the modern circus(D) The modern circus t