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A. 6Сʱ              B. 12Сʱ             C. 18Сʱ             D. 24Сʱ

2. Ôڼ׵㿴ÈÕ³ö£¬Ì«ÑôλÓÚ¹Û²âÕߵķ½Î»ÊÇ£¨   £©

A. 6ÔÂ22ÈÕ—Õý±±                            B. 12ÔÂ22ÈÕ—ÕýÄÏ

C. 3ÔÂ21ÈÕ—Õý¶«                            D. È«Äê—Õý¶«

3. µØÇò±íÃæ c¡¢d Á½µã¼äµÄ¾àÀëÊÇ£¨   £©

A. 1000 km             B. 20000 km            C. 30000 km            D. 40000 km

¡¾´ð°¸¡¿1. B    2. C    3. B