【简答题】BEIJING--Lights went out for an hour at some famous landmarks and homes all over the world on March 28 for Earth Hour 2010. It is a global created by the WWF(World Wildlife Fund) to make people ...
【简答题】Suddenly all the lights on that crowded underground train went out. Then it stopped in that dark tunnel(隧道). We waited. We expected the lights to come on again soon. But nothing happened. Then I began...