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（）。
多项选择题 岩浆岩结构一般按矿物颗粒结晶程度和晶体的大小来分，常见的有（）。
单项选择题 It’s so nice to go out for a walk acool nice summer evening． A．in B．on C．for D．a
