【文章內(nèi)容簡介】 an public elementary schools in that the activities focus on the A B Cchild39。s individual abilities and interests rather than academic ones. D23. Josh Billings roamed the country as a laborer when he was a young man, but settled down in A Bhis later life to bee a humorist and lecturing. C D24. Data received from two spacecraft indicate that there is many evidence that huge A Bthunderstorms are now occurring around the equator of the planet Saturn. C D25. Every individual cell, whether its exists as an independent microorganism or is part of a A Bplex creature, has its own life cycle. C D26. Because aluminum is nonmagnetic, it is value for protecting electrical equipment from A B C Dmagnetic interference.27. Nitrogen and oxygen are too important that most living organisms cannot survive without these elements.28. Coal and petroleum resulted when plants bee buried in swamps and decayed. A B C D29. Percapita ine is a nation39。s entire ine dividing by the number of people in the nation. A B C D30. Jim Thorpe, a football, track, and baseball stars from Pennsylvania, is considered by many to A B Cbe the greatest allaround athlete of modern times. D31. For centuries waterwheels were the only sources of power aside from human and animal A B Cstrong . D32. Proteins form the most of the structure of the body and also act as enzymes. A B C D33. The attorney general of the United States advises the President on any questions of law who A Bmay arise in the conduct of administrative affairs. C D34. Many of the science fiction publications by Ray Bradbury display a desire to rebel against A B Csociety39。s depend on machines. D35. The age of a geological sample can be estimated from the ratio of radioactive to A Bnonradioactive carbon present in the object is examined. C D36. Dams vary in size from small rock barriers to concrete structures many feet height. A B C D37. Even before the human organism developed into their present stage of home sapiens, the A B Cbeginnings of culture were already evident. D38. In the United States, sleds for recreation were first produced mercial in the 187039。s or A B C Dthereabouts.39. Employments agencies bring together persons qualified for specific jobs and employers who A B Chave those jobs available. D40. Salmon spend most of their adult lives in salt water, despite they return to their freshwater A B C Dbirthplaces to spawn and die.CPassage 1 During the early years of this century, wheat was seen as the very lifeblood of Western Canada. When the crops were good, the economy was good。 when the crops failed, there was depression. People on city streets watched the yields and the price of wheat with almost as much feeling as if they were growers. The marketing of wheat became an increasingly favorite topic of conversation. War set the stage for the most dramatic events in marketing the western crop. For years, farmers mistrusted speculative grain selling as carried on through the Winnipeg Grain Exchange. Wheat prices were generally low in the autumn, but farmers could not wait for markets to improve. It had happened too often that they sold their wheat soon after harvest when39。 farm debts were ing due, only to see prices rising and speculators getting rich. On various occasions, producer groups asked for firmer controls. but governments had no wish to bee involved, at least not until wartime wheat prices threatened to run wild. Anxious to check inflation and rising living costs, the federal government appointed a board of grain supervisors to handle deliveries from the crops of 1917 and 1918. Grain Exchange trading was suspended, and farmers sold at prices fixed by the board. To handle the crop of 919, the government appointed the first Canadian Wheat Board, with full authority to buy, sell, and set prices. is the main purpose of the passage? (A)To explain how wheat is marketed today(B) To justify suspension of trading on the Grain Exchange(C) To describe the origins of the Canadian Wheat Board(D) To argue for further reforms on the Canadian Wheat Board1. The author uses the term lifeblood (line 1) to indicate that wheat was (A) difficult to produce in large quantities (B) susceptible to many parasites (C) essential to the health of the country (D) expensive to gather and transport. 2. According to the passage, most farmers debts had to be paid (A) when the autumn harvest had just been peted(A) because wheat prices were high (C) as soon as the Winnipeg Grain Exchange demanded payment(D) when crop failure caused depression 4. According to the passage. wheat prices became unmanagea