(C) Maple syrup is produced in rural areas that suffer from high unemployment.
(D) Technological improvements in maple-syrup harvesting have reduced production costs.
(E) Maple-syrup prices have risen many times in the past， though never before at the rate recently observed.
8. Artificial seaweed made of plastic has been placed on a section of coast in order to reverse beach erosion. The inventor of the seaweed has concluded that the recent buildup of sand on that section of coast proves that the artificial seaweed reverse beach erosion.Which of the following， if true， would most seriously weaken the inventor’s conclusion?
(A) The amount of recent sand buildup on that section of coast was less than had been predicted on the basis of the results obtained in controlled experiments.
(B) Because artificial seaweed would be buried eventually by additional sand deposits on the coast， more artificial seaweed would need to be put in place every four years.
(C) Artificial seaweed of another material which had been previously developed by the inventor failed to add sand to coastline in past trials.
(D) The amount of recent sand buildup on that section of coast is the same as the amount of recent sand buildup on otherwise very similar section of coast without artificial seaweed.
(E) The amount of recent sand buildup on that section of coast， although considerable， is not yet enough to replace the amount lost during storms on that section of coast in the last twenty years.
9. The presence of microorganisms that produce a toxin causes seawater to turn brownish red， phenomenon known as a red tide. Sea otters do not feed in areas where clams， their main source of food， have become contaminated with this toxin. According to a proposed explanation of the otters’ behavior， the otters sample the clams in a potential feeding areas and can taste any toxin in them.
Which of the following， if true， would most strongly indicate that the hypothesis described in the last sentence of the passage is not correct?
(A) In some of the areas where red tides occur， neither clams nor sea otters are indigenous species.
(B) The presence of sea otters in a given areas has a significant effect on which other marine organisms are to be found in that area.
(C) When seawater in an area unaffected by red tide is artificially dyed brownish red， sea otters do not feed on the clams in that area.
(D) If the clams in a given area are contaminated with toxins， sea otters move to other areas in search of food.
(E) Although very small amounts of the toxin produced during a red tide are not harmful， large doses can be fatal to animals the size of sea otters.
10. Since 1945 there have been numerous international confrontations as tense as those that precipitated the Second World War， and yet no large-scale conflict has resulted. To explain this， some argue that fear of enomous destruction such as the Second World War produced has had a dramatic deterrent effect.英语作文
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