题目

商品谷物农业的区位条件一般有         （    ） ①机械化水平高     ②地广人稀   ③市场广阔，交通运输便利    ④自然条件优越     ⑤农业科技发达       A．①②③⑤     B．①②③④       C．②③④⑤       D．①②③④⑤ 答案：D In order to learn the _______ of the family business, Bill took a job as messenger boy in one of the offices. A. ins and outs       B. dos and don’ts C. heads and tails   D. t’s and i’s