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U2 36. Great as Newton was, many of his ideas ____________ today and are being modified by the work of scientists of our time. A. are to challenge B. may be challenged C. are challenging D. have been challenged 请根据需要填入 Script: 正确答案：D 得分：0 分 37. Polar explorers have to be extremely _____ to endure the climate and other hardships. A. rough B. giant C. progressive D. tough 请根据需要填入 Script: 正确 答案：D 得分：0 分 38. Life depends on the _________ between the heat received from the sun and the heat lost to cooler surroundings. A. relationship B. contrast C. exchange D. balance 请根据需要填入 Script: 正确答案：D 得分：0 分 39. American consumers prefer white eggs; _________, British buyers like brown eggs. A. additionally B. moreover C. conversely D. comparatively 请根据需要填入 Script: 正确答案：C 得分：0 分 40. Your failure in the final examination is due to the fact that you didn't ______ enough importance to your English. A. attend B. attack C. attach D. obtain 请根据 需要填入 Script: 正确答案：C 得分：0 分