单选题
编号：2578869
1.Whichofthefollowingistrue?
- A.Enwave'ssystemissaidtoworkonlyincitieslocatedneartheGreatLakes.
- B.ThewaterdeepinLakeOntarioalwaysremainsatthesametemperature.
- C.ExpertswarnthattheuseofCFCsinEnwave'ssystemwilladdtoglobalwarming.
- D.Torontoisnowsearchingfornewnaturalsourcesofwatertouseinitswatersupply.