营销分析是建立在对( )的基础上的，包括对竞争对手的分析。
A．市场深刻理解 B．市场的绝对熟悉C．市场独特见解 D．市场足够了解
参考答案：A
— He ought to have been warned of the danger.
— ______, but he just wouldn’t listen to me.
A．So ought he
B．So he was
C．So was he
D．So he had
外径是73mm的油管其壁厚为5．5mm，内径为φ（）mm。
A.75.9
B.62
C.80
D.82
