How does Red Bull work as an energy-booster?（ ）
A、It makes people energetic.
B、It makes people attentive.
C、It makes people nervous.
D、It makes people refreshed.
【正确答案】：C
【题目解析】：听力原文：That seems to be changing lately, though. Sales growth has slowed as awareness of the fact that drinking vitamin water isn't the same as eating a salad, has grown. “Sports drinks” like Pepsi Co’s Gatorade brands and Coca-Colas Powerade line are touted as enhancing athletic performance, while energy drinks like Red Bull and Monster are sold as just that—energy— boosters, when all they really do is make you nervous and distracted for a while before the inevitable crash.本题考查红牛作为能量助推器的的原理。原文说虽然像红牛和怪兽这样的能量饮料只是作为能量助推器出售，但它们真正做的是在不可避免的崩溃之前让你紧张和分心一段时间。可知C项像红牛这样的能量饮料让人紧张，符合题意。
