第19题: [单项选择]So ______ that no fish can live in it. A. the lake is shallow B. shallow the lake is C. shallow is the lake D. is the lake shallow 参考答案:C 答案解析:shallow is the lake为倒装形式,强调shallow,原句是The lake is so shallow that no fish can live in it.
第20题: [单项选择]()粘土含有K2O。 A. 高岭石类 B. 蒙脱石类 C. 伊利石类 D. 水铝英石类 参考答案:C