设函数f(x)=ln(3x)，则 f'(2)=（）
设矩阵请验证。
Johnsaysthathispresentjobdoesnotprovidehimwithenough______forhisorganizingability.
Tobe____forthecorporateshareholder'sprogram,youmusthavebeenworkinghereforatleastthreeconsecutiveyears.
Hiswifehasbeen_______alotofpressureonhimtochangehisjob.
