为增强建设美丽中国的责任感，某校九年级（6）班开展了“建设美丽中国 共筑和谐家园”的主题班会。下面是三位同学在班会活动中的对话。
小杨：浪费在我们身边十分普遍，食堂里的剩菜剩饭，每天都要装几大桶；本可再用的纸却变成了污染环境的垃圾。
小汪：邻居张阿姨家经济条件并不富裕，但为了有一个男孩，硬是生养了四个孩子，四个孩子的吃饭、读书都成了问题！
小邓：近年来，各地的私家车急剧增加，不但造成交通拥挤，更重要的还在于汽车排放的尾气，使空气中的PM2.5浓度急增。

科学家将某些农作物的种子放在神舟八号飞船里，在太空飞行返回地面后，经试种，个别种子的某些性状发生了较大改变，其原因是（　　）

阅读下列短文，按照句子结构的语法性和上下文连续的要求，从各题所给的A、B、C和D中选出最佳选项．

    More than 700 years ago，Scotland （苏格兰） was fighting with England．The king of England wanted to 1 Scotland．He had a strong army so it was2for the Scots to fight．They lost many times，King Robert of Scotland had to run from the English army．

    One rainy day，King Robert lay in an old house．He thought that he was not good enough to be king．He was so3that he didn't even see a spider（蜘蛛）near him．He 4when he saw the spider climbing．It was trying to climb up its web at the top of the house but it fell down．

    "How sad"thought King Robert．"The spider is like me．It's not 5enough．"He watched while the spider climbed up again．It fell down a second time．

    "Be careful，little spider，or you might die，"he said．"Life is so hard．You'll never get back to your web．"But the spider 6again and again．King Robert watched while it 7climbed back to its web．After an hour，the spider got do the web．

    "You are such a great 8，"he said．"If you can keep trying．I can too．I must keep on fighting．I won't let the English win．"His 9grew strong and they 10the English army．Scotland was free．

    Nobody knows if this is a true story．Many parents tell it to their children because they want them to keep trying．