This is not an economical way to get more water; , it is very expensive.A. on the contrary

This is not an economical way to get more water; , it is very expensive.
A. on the contrary
B. on the other hand
C. on the whole
D. on earth

(答案→)A. on the contraryB. on the other handC. on the whole D. on earth解析：A. on the contrary相反 B. on the other hand另一方面C. on the whole大体上 D. on earth究竟；句意：这不是一种非常经济的取水方法；相反，它非常的昂贵。故选A

这个答案应该是对的