12.請依下文回答第42 題至第45 題
With the increasing water shortages and growing water conflicts, some people start to ask: why don’t we get our
drinking water from the ocean? The problem is that the desalination of water requires a lot of energy. Salt dissolves very
easily in water, forming strong chemical bonds, and those bonds are difficult to break. Energy and the technology to
desalinate water are both expensive.
There are environmental costs of desalination as well. Sea life can get sucked into desalination plants, killing small
ocean creatures, and upsetting the food chain. Also, there’s the problem of what to do with the separated salt. Pumping
this super-salty water back into the ocean can harm local aquatic life. Reducing these impacts is possible, but it adds to
Despite the economic and environmental hurdles, desalination is becoming increasingly attractive as we run out of
water from other sources. We are over-pumping groundwater, we have already built more dams than we can afford
economically and environmentally, and we have tapped nearly all of the accessible rivers.
Far more must be done to use our existing water more efficiently, but with the world’s population escalating and the
water supply dwindling, the economic tide may soon turn in favor of desalination.
【題組】42 Which of the following is NOT mentioned in the passage as a reason why we don’t desalinate water from the
(A) Marine ecology might be disrupted.
(B) Desalinating seawater is rather costly.
(C) Land for desalination plants can’t be easily acquired.
(D) The chemical bonds in saltwater are difficult to break.