根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Tom with his family 1 near the sea. Their house is not very high, but it is beautiful. There 2 big trees and a small garden in front 3 their house. They plant flowers in the garden. Some of the flowers are red, some are white 4 some are blue. Tom and his family love 5 garden very much.

      6 Tom and his sister go to school 7 bus. The bus is comfortable. There are air conditioners in the bus. And it is a double-decker bus. After school, they sometimes help their mum 8 some shopping at the shopping centre, and sometimes help their dad in the garden. At weekends, they often take some photos by the sea. 9 summer, they often go swimming 10 their parents.

有人说：公平总是相对的，无论我们如何努力，都不可能达到绝对公平。所以我们就没有必要为了追求公平而努力了。

项羽    刘备    陶渊明    诸葛亮

历史人物：____       成语：____

如图所示，电源电压恒为4V，灯泡标有“4V  2W”字样（灯丝电阻不变）．当S₁、S₂都闭合，且滑动变阻器R₂的滑片P在中点时，电流表示数为0.9A，此时灯泡的功率为P₁，当S₁、S₂都断开时，灯泡实际消耗的功率为P₂，且P₂：P₁=1：4．求：