This is not an economical way to get more water; , it is very expensive.
A. on the contrary
B. on the other hand
C. in short
D. in all
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(答案→)A. on the contrary
B. on the other hand
C. in short
D. in all
解析：考查介词短语：A. on the contrary正相反B. on the other hand另一方面C. in short简言之 D. in all总共，句意：这不是得到更多的水的有效方式，正相反，这是更贵的。选A。