31.  When the aerials are down, and your spirit is covered with snows of cynicism and the ice of pessimism, then you are growing old, even at 20, however as long as your aerials are up, to catch waves of optimism, there is hope you may die young at 80.
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【正确答案】 1、C。however作“然而,可是”讲时,较but意味稍弱,且后应跟有逗号,使其与句子的其他部分隔开。因此,将however改为but。    
【答案解析】