某航运公司共有3艘货船，其有关营运数量指标如下：
船名定额吨位（吨）有册时间（天）营运时间（天）航行时间（天）年航行距离（海里）航次数
X 5000 365 290 250 60 000 20
Y 10 000 365 300 180 42 000 10
Z 15 000 365 310 220 40 000 10
请回答下列问题：
该航运公司三艘船舶的平均航速为（）海里/天。
A.207.87
B.206.67
C.208.77
D.205.78
参考答案：A
John loved basketball. One day, as he was walking to a basketball game, he dreamed about playing basketball for the college team the next year. Suddenly a car hit him and he was thrown three meters 36 . John woke up in a hospital room. When the doctor told him that both his legs were broken, he knew his college basketball 37 was over. John did what the doctors told him. but it 38 . When he left the hospital, John was sent to a rehab center(康复中心). A week 39 he arrived there, he met Sunny Chen. Sunny used to be a coach(教练). His legs were badly hurt in a skating accident. Though he couldn’t move his legs, Sunny became the coach of a basketball team called the Suns. It was an on-wheelchair basketball team, because 40 on the team played from a wheelchair(轮椅). Sunny invited John to 41 the game. John played badly, but for the 42 time since the accident. he stopped feeling sorry for himself. After becoming a part of the Suns. John improved quickly. Basketball was like medicine for him. John was much 43 than before. When John became unhappy, Sunny was there to comfort him. The day before John 44 the center, he had dinner with Sunny. He asked Sunny how he could be so happy even with his broken legs. Sunny 45 and said, "It’s really quite easy. When you keep your face to the sun. the shadows will fall behind."
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