题目

Barack Obama, Lady Gaga and Steve Jobs—what do they have in common? They are, of course, all Americans. And according to a survey, they all best illustrate(举例说明) the word “cool”. But just what does it mean to say someone is “cool”? Most would answer that it is something to do with being independent-minded and not following the crowd. Yale University art professor Robert Farris Thompson says that the term “cool” goes back to 15th century West African philosophy(哲学). “Cool” relates to ideas of grace(优雅) under pressure. “In Africa, ” he writes, “coo四川南充果农将广柑贮藏于密闭的土窑中，贮藏时间可以达到4～5个月之久；哈尔滨等地利用大窑套小窑的办法，可使黄瓜贮存期达到3个月，这种方法在生物学上称为“自体保藏法”。关于“自体保藏法”的说法不正确的是(　　) A．“自体保藏法”是一种简便的果蔬贮藏法，但易受外界环境的影响 B．“自体保藏法”的原理是依靠果蔬呼吸释放的二氧化碳抑制自身的呼吸作用 C．在密闭环境中，二氧化碳浓度越高，贮藏效果越好 D．在“自体保藏法”中如能控在室温，则贮藏时间应该会更长