”可知答案。故选B。 23. D细节理解题。根据最后一段“Dragonflies often have a favorite spot that they returnto time after time to rest."可知答案。故选D。 反馈 收藏
Gene KimJessica Orwig
But often they're at or near the bottom. If they can, they hide in a place near rocks or plants so enemies can't get them and the water can't sweep them away.There are, however, many kinds of fish that must swim to breathe. This is true for many sharks,like great white sharks...
Earth late home to the survival of humans, its like mother, provides us with resources and conditions, who wouldnt want to make their homes more beautiful, but the reality is that we have been scarred earth. The protection of the environment is urgently needed. People often talk about protect...
Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
From an early age, we often hear phrases like “you must sleep a minimum of 8 hours a day.” It’s common knowledge that this brings invaluable health benefits, from reducing stress levels and keeping the immune system strong, to improving concentration, memory and decision-making skills. To...
The Shuar lived spread over a comparatively large geographic area, so raiding parties often traveled for days to carry out attacks. The process of shrinking an enemy's head can't wait until the raiders return home, so the raiders begin the process on the way back. The leader of the party...
Although most bodies are discovered long before dust has returned to dust, enough time -- anywhere, say, from a few days to many years -- has often passed that it's impossible to visually determine the identity of a body found under mysterious circumstances. Skin, muscle and other tissue ...
If you think about it, it’s remarkable that one animal can breathe through its gills, its lungs, and its skin—all in the same lifetime. We frequently think that breathing is performed by a separate breathing organ—gills for fish, trachea for insects, or lungs for humans—but for the...
Frogs can actually breathe in two different ways: either through their mouths and nostrils into their lungs (much like humans and other animals do) or...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...