零售业推销每次交易量小，但交易次数频繁、总的（）；顾客主动找上门来，售货员无须走出门去。
参考答案：成交量大
In the wartime, the masses devoted whatever they had to ______ the army in fighting against the Japanese.
A．have supported
B．support
C．having supported
D．supporting
患者，女，27岁，既住月经不调，现月经6月末行，B超检查，吕腔内可见胎体，诊断是
A．闭经B．月经后期C．妊娠D．异位妊娠E．月经先后不定期
