简述盐水的水源。
参考答案：
主要为电解槽回来的淡盐水，再加上离子交换塔再生时产生的水，以及其他一些杂水。
—What did Mr Black say just now?
—He asked us _______ tomorrow. [ ]
A. what would the weather be like?
B. what will the weather be like
C. what the weather would be like
D. what the weather will be like
