Peter: What are you doing for vacation, Steven?Steven: I’m visiting my aunt in San Francisco. My brother’s staying there. He’s joining a club.Peter: Oh? When are you going?Steven: Ne
短文填空。Do you know Sweden？It l (1)in the north of Europe. It is the fourth largest country in Europe with an area of 450,000 square kilometers and a p (2) of about 8.5 million. Over one thir
，点D为AC的中点，点E在边BC 上，且ED⊥BD，则△CDE的面积是 ▲ ．
