Despite the economic and environmental hurdles, desalination is becoming increasingly attractiveas human beings are using up fresh water from other sources. At present, desalinating seawater isthe only viable way to provide water to growing populations in rural areas of the Middle East andNorth Africa. Therefore, the race is on to find a cheaper, cleaner, and more energy-efficient wayof desalinating seawater, and promising new findings are being reported.
【題組】28. Which of the following is closest in meaning to “promising” in the first paragraph?
(A) Gloomy.
(B) Hopeful.
(C) Conservative.
(D) Doubtful.