Which of the following statement about using quotation is incorrect?

A、Payingattentiontothecredibilityoftheoneyouquotefrom;
B、Usinglongquotations,aslongaspossibletoshowyourknowledge;
C、Tomakequotesinteresting,introducetheexpertswiththeirbackgroundinformation;
D、Keepingtheexpert'swordsbrief,andreadtheminalivelyandconvincingmanner