题目

Scientists predict that one of the world's coldest countries could be covered by thick forests instead of frozen ice sheets by the end of the century, as climate change brings about the “greening of Greenland”. Today only four types of trees grow on the island, limited to small areas in the south. More than three­quarters of Greenland is covered by ice. But by the year 2100, “Greenland could become a lot greener, ”says Professor Smith from Aarhus University in Denmark.“Pine tree forests like those in Alaska and Canada will be able to spread over most of Greenland. And it wil买一个布娃娃要21.7元，买一个玩具熊要8.5元．布娃娃比玩具熊贵多少元钱？