humans learn to recognize their mother's voice from the womb(子宫).For birds such as superb fairy-wrens,which perfect their songs with parental teaching,it was thought that sound perception began after hatching.But when it became clear that mother birds were intentionally sing...
Phones, give out less radiation to send texts than to carry a person's voice. Texting also keeps radiation away from your head. 5.Poor signal? Stay off the phone. A poor signal means that the phone needs to give out more radiation to work. Make and take calls when your...
(1) The old man told the boys the story in order to . A . stop them from throwing stones at the bird B . be in memory of the old couple C . tell them how pleasant the bird's voice was D . warn them of some hidden danger. (2) We can infer from the underlined sentence ...