李老师要对初三（1）、（2）班的考试情况进行分析，在两个班里随机抽取了30名学生的考试成绩：87、75、94、60、51、86、73、89、93、67、57、88、82、66、88、88、85、67、91、65、78、89、80、72、78、84、90、64、71、86．

根据上述消息回答下列问题：

（2）估计这两个班级本次考试成绩在80分及80分以上的占____ %；

（4）是否一定能根据这30名学生的成绩估计全区考试成绩？答：____ ．

（5）80～90组的平均分为____ ，中位数为____ ．

下列有关血液的叙述，正确的是（　　）

    My great-grand mother, Winifred Hastings, got rich in a mining（采矿）town out West. But her 1 didn't come from gold or silver, but from soup, steak, apple pie, and good coffee.

    In the early 1900's, Winifred arrived in Silver City with her husband. But he caught a fever and died suddenly. With the little money she had, Winifred decided to open a practical restaurant to 2 all the hungry miners in town.

    The restaurant had only wooden boxes for tables, but business was very good 3. The miners 4 that Winifred was a great cook, 5 they ate in her restaurant every day.

    One time, Winifred had a small accident in the restaurant. A fire started in the kitchen and her customers had to put it out. The town mayor walked in 6 there was still a lot of smoke in the room. “Winifred,” he said. “What are you cooking back there?” Everybody 7.

    In 1905, Winifred got married again and moved out of town. On her 8 day in Sliver City, a photographer took her picture. The picture is over my desk at home. It shows Winifred with about fifty miners standing in front of the restaurant. At the top of the photo 9 says: TO WINIFRED THE BEST COOK IN THE WEST. 10 YOUR BOYS.