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Caffeine, a substance found in coffee and some soft drinks, is also a drug.
出自-2015年12月听力原文
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The caffeine—the equivalent of two strong cups of coffee, was sufficient to reverse this effect, with some cyclists even displaying increased eye movement speeds.
2017年6月四级真题(第三套)阅读 Section A
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To find out, researchers gave 11 volunteer cyclists a carbohydrate solution either with a moderate dose of caffeine, which is known to stimulate the central nervous system, or as a placebo without, during 3 hours of cycling.
2017年6月四级真题(第三套)阅读 Section A