（）识别关键营销目标和战略的基础。
A.营销评审
B.SWOT分析
C.市场细分
D.营销划规
参考答案：B
Mike pretended _____ his homework when mother came. [ ]
A. to do
B. have done
C. did
D. to be doing
影响载体催化元件灵敏度的因素有哪些？
