问答题 1 The market investigation is indispensable to sales promotion. 2 They are as closely related as the lips and teeth, so to speak. 3 What you produce is for sale on the market. 4 It would be impossible to succeed in selling a product without first investigating the market. 5 In the international market, goods on sale coming from different countries and suppliers are always facing keen competition. 6 Under such circumstances, they will try everything possible to familiarize themselves with the market conditions.