题目

书面表达：根据所给单词写一段50词左右、意思连贯的短文。 Mother's Day, Lily, get up, in the morning, to buy, happy                                         答案：Today is Sunday, May 13. It's Mother's Day. Lily got up at 6:35 in the morning. After breakfast, she went to a flower shop to buy some flowers for her mother. She gave the beautiful flowers to her mother. Her mother was very happy.两颗人造卫星A、B绕地球做匀速圆周运动，周期之比为TA∶TB＝1∶8，则轨道半径之比和运动速率之比分别为 A．RA∶RB＝4∶1，vA∶vB＝1∶2          B．RA∶RB＝4∶1，vA∶vB＝2∶1 C．RA∶RB＝1∶4，vA∶vB＝1∶2          D．RA∶RB＝1∶4，vA∶vB＝2∶1