单项选择题 —Whatdo you want those old boxes? —To put things in when I move to the newflat． A．by B．for C．of D．with

单项选择题 After the new techniquewas introduced，the factory produced tractors in 1988 as the year before． A．as twice many B．as many twice C．twice as many D．twice many as

多项选择题 根据地下水的埋藏条件其基本类型可分为（）。