A．has been covered up by vast clouds of dust and gasB．s……

问答题有谁未曾享受过开窗的喜悦呢打开窗子，突然见到青山闯了进来；打开窗子，看到柳色的清新，看到小燕子飞来。 窗子开了，用不着打招呼，新的空气就会猛扑过来。 当然，随之而来的，也有风沙飞入屋中。还有眼睛看不到的微尘，还有很难发觉的细菌，有的是出面拜访，有的是偷偷地混了进来。 从古到今多少诗人赞美过窗子，多少歌手歌唱过窗子，多少情人的眼睛凝望过窗子。

填空题with改为as。

填空题将majority改为minority。

问答题Pay attention to the messages you are sending to your family. Don’t ever give them the impression that the house is more important than they are. This is not, however, a license for sloppiness. Some people live in virtual squalor and justify it by saying they’ d rather spend time with their kids than dean house, This, too, has an adverse effect. What we’ re looking for is a middle-of-the-road approach, and I can’t paint the lane lines for you. Only you can do (hat. Be honest with yourself and discover if you’ re guilty of tipping the scale one way or the other. If you’re too close to the situation, talk it over with your family or with a friend who has the courage to tell the truth. You cannot become a happily organized family unless you find that comfortable fine line between perfection and pigsty.

单项选择题The novel is structured around the discovery of the hero's origin. The novel probably refers to ______.