六级必会短语1.Above all:最重要的是most important of allAbove all theyll have to discover how much nitrogen it possesses since nitrogen is45 of the air breathe.(2002-1)2.Account for:解释说明How do you account for

　2011年12月英语六级考试必会短语88句　　1.Above all：最重要的是most important of all　　Above all theyll have to discover how much nitrogen it possesses since nitrogen is45 of the air breathe.(2002-1)　　2.Account for：解释说明