【单选题】听力原文:M:I have never heard such a fascinating lecture on solar energy. But you don't seem to be impressed. Don't you like it, Sally? W:Well, I must admit that I dozed off most of the time. I think it's...
【单选题】____ of time and energy have been spent in making the earthquake-stricken areas a permanent museum to remind people how disastrous a natural disaster can be.