阅读理解 阅读下列短文，选出最佳答案。

    “I will think of it.” It is easy to say this, but do you know what great things have come from thinking?

    Sir Isaac Newton was sitting in his garden when he saw an apple fall from a tree. He began to think and tried to find out why the apple fell. Then he discovered how the sun, moon, and stars are kept in their places.

    A boy named James Watt sat quietly by the fire, watching the lid of the kettle move up and down. He wanted to find out why the steam in the kettle moved the lid. From that time he went on thinking and thinking. And when he became a man, he improved the steam engine (蒸汽机) so much that it could easily do the work of many horses.

     James Ferguson was a poor boy. Once, seeing the inside of a watch, he wondered. “Why should I not make a watch?” But how could he get the materials to make the mainspring (钟表的主发条)? He soon found he could make it with whalebone (鲸骨). He then made a wooden clock which kept good time. His motto (座右铭) was “I will think of it.” And he made his thoughts useful to himself and the world. 

    Boys and girls, when you have a difficult lesson to learn, don't lose heart, and don't ask someone for help before helping yourselves. Think, and by thinking you will learn how to think to some purpose.

    Mr. White's family decided to repair their house. Mr. White bought the house two and a half years ago. Since his kids were growing up, he and his wife wanted to make some changes to the house.

    They decided to knock down their living room wall to open up the space. When the wooden walls were moved, they were shocked to find a lizard (蜥蜴) stuck in the small space between the walls. The lizard's foot was stuck by a nail (钉子) which was knocked into the wall from the other side several months ago. However, they wondered how the lizard had survived so long without moving from that place.

    The family decided to wait for a while and see how the lizard survived several months without moving. While they were doing other things, they kept an eye on the lizard. The son, Ray, suddenly shouted, “Dad, look here!”

    Another lizard appeared, carrying food to the stuck lizard's mouth. That was a real surprise! Everyone was touched that the lizard fed the other one for all this time.

    Both lizards had never-ending hope for each other and carried their hearts with love and care. Why can't we humans always carry that kind of love in our hearts? Life is full of all kinds of difficulties. What we can do is to give our hand to the one in need and share our love. Sharing is caring.

    Jerry worked in an office in the city. He worked very hard and really looked forward to(期待) his vacation. He usually went to the seaside, but one day he saw an ad(广告) in a newspaper.

    "Enjoy country life. Spend a few weeks at William Farm. Good food, fresh air, horse riding, walking, fishing…"

    "This sounds like a good idea," he thought. "I'll spend a month at William Farm. I'll go horse riding, walking and fishing. It'll be different from the seaside." Four days later, he returned home.

    "What's wrong with William Farm?" his friend Jack asked him. "Don't you enjoy your country life?"

    "Country life was fine," Jerry said. "But there was another problem."

    "Oh, what problem?" Jack was very surprised.

    "Well, the first day I was there, a sheep died, and we had roast(烤) mutton for dinner."

    "Fresh meat is the best."

    "I know, but on the second day a cow died, and we had roast beef for dinner."

    "Lucky you!"

    "You don't understand," Jerry said, "On the third day a pig died, and we had roast pork for dinner."

    "Wow, a different roast every day!" said Jack.

    "Let me finish." Jerry said, "On the fourth day a farmer died and I didn't want to stay there for dinner."