小军在“探究凸透镜成像规律”的实验中，实验装置的示意图如图所示．a、b、c、d、e是主光轴上的5个点，F点和2F点分别是凸透镜的焦点和2倍焦距点．

阅读材料，回答问题

材料一：2015年是西藏自治区成立50周年，新疆自治区成立60周年纪念日。五六十年来，西藏和新疆各族人民在党中央的坚强领导和特殊关怀下，取得了短短几十年跨越上千年的辉煌成就，充分体现了民族区域自治制度的巨大优越性。

材料二：2016年2月14日，“感动中国”2015年度人物评选结果揭晓，带领全村人民奔小康，促进民族团结的基层村干部维吾尔族的买买提江·吾买尔当选为感动中国年度人物。

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    One day, a farmer took a bag of wheat to town. He didn't know what 1 when the bag fell off his horse. The bag was 2 heavy for him to lift. He hoped that 3 would come and help him.

    Before long a man came over. But the farmer was 4 when he saw the man, because he was the famous judge(法官) in "town. The farmer was afraid to ask him for 5.

    As soon as he came up to the farmer, the judge 6 his horse and said," You need my help, don't you? Let me help you." Then he took one end of the bag, and the farmer took 7. They 8 the bag of wheat onto the horse.

    "Sir," asked the farmer, "how can I 9 you?"

    "Well," the judge replied, " 10 you see anyone in need of help, do the same for him."

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