吐温类可以增加尼泊金类在水中的（），但却不能相应的增加（）能力。
参考答案：溶解度；防腐
Busy as Tom is, exercise has always been______his work.
A．as a part of his life much as
B．as much a part of his life as
C．as much as a part of his life
D．so much a part of his life as
地震预报有几要素（）
A、三要素
B、四要素
C、二要素
