Two birds are looking for 61. ______ideal(理想的) place to live in, only 62._______(find) a tree-like chimney (烟囱) with heavy smoke rising from 63.______. Poisoned 64.___________(serious), t
Animals and the places where they live are getting pushed aside as households(家庭)decrease in size and increase in number. Smaller numbers of people per household on average use more