题目内容
_______ are wholesalers of shares who keep supplies of the shares in which they deal, making a continuous market for buyers and sellers.
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A______ is someone who writes out and signs a cheque ordering his bank, called the drawee, to pay a sum of money on demand.
Technically, a ______ is a profitable product or business with high market share in a low-growth market, but it is also used to mean any profitable product or business generating a steady flow of sales revenues.
以外层果皮入药的是（）
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