答案：

　　26.C，本题为细节题。由文章第一段“Do you know ... have their special colors？ Colors are used mainly to protect themselves.”可知答案为 C。

　　27.B，本题为细节题。由文章第二段“Some other insects with different colors ... by others. So they have to hide themselves in the day and appear only at night.”可知答案为 B。

　　28.D，本题为细节题。由文章第三段“ Bears， lions and other animals ... by hunters（猎人). This is because they have the colors much like the trees.”可知答案为 D。

　　29.B，本题为细节题。由文章最后一段“While the liquid spreads over (散开)， its enemies(敌人) can‘t find it. “可知答案为 B。

　　30.A，本题为主旨大意题。本文主要讲了各种各样的动物或者昆虫是如何保护自己的，可知答案为 A。