题目

如图，在Rt△ABC中，∠ACB＝90°，点O在BC上，以点O为圆心，OC为半径的⊙O刚好与AB相切，交OB于点D．若BD＝1，tan∠AOC＝2，则⊙O的面积是（    ） A．π                                     B．2π                                   C．                                D．17．回答第6和第7题．6．What did the speakers eat when they were young？A．Very healthy bread．B．Bread made with only few ingredients．C．Bread with a lot of artificial things in it．7．What does the man want to make？A．A whole loaf of bread．B．A pizza．C．A sandwich．