题干

下列关于物理学史实的描述,正确的是(     )

A:开普勒最早提出了日心说

B:牛顿发现了万有引力定律,并测定了万有引力常量

C:海王星是人们依据万有引力定律计算的轨道而发现的

D:天王星是人们依据万有引力定律计算的轨道而发现的

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答案(点此获取答案解析)

C

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阅读理解

    A baby giraffe is born 10 feet high and usually lands on its back. Bringing a giraffe into the world is a tall order. In his book, A View from the Zoo, Gary Richmond describes how a new-born giraffe learns its first lesson.

    The mother giraffe lowers her head long enough to take a quick look. Then she puts herself directly over her child. She waits for about a minute, and then she does the most unreasonable thing. She throws her long leg and kicks her baby, so that it's sent sprawling (四脚朝天).

    When it doesn't get up, what the mother has done is repeated again and again. The struggle (挣扎) to rise is important. As the baby giraffe grows tired, the mother kicks it again. Finally, it stands for the first time. Then the mother giraffe kicks it off again. Why? She wants it to remember how it can get up. In the wild, a baby giraffe must be able to get up as quickly as possible to stay with its group, where there's safety.

    Another writer named Irving Stone understood this. He spent a lifetime studying great people, writing stories about such men as Michelangelo, Vincent van Gogh, Sigmund Freud, and Charles Darwin.

    Stone was once asked if he had found something unusual about these great people. He said, “I write about people who sometime in their life have a dream of something. They're beaten over the head, knocked down and for years they get nowhere. But every time they stand up again. And at the end of their lives they've realized some small parts of what they set out (着手) to do.”