他是我国核武器理论研究工作的奠基者之一。从原子弹、氢弹原理的突破和试验成功及其武器化，到新的核武器的重大原理突破和研制试验，均作出了重大贡献。是中国核武器研制与发展的主要组织者、领导者，被称为“两弹元勋”。他就是（    ）

一定限度内的发热是身体抵抗疾病的生理性____反应．

I have a healthy ____ (饮食).

2009年，是中国文化大发展的标志年。这一年，在世界金融风暴的背景下，中国文化产业异军突起，逆市上扬，不仅为全年经济“保八”顺利实现贡献了重要力量，而且成为地方经济的重要支柱。这表明
①文化产业的发展有利于综合国力的提高 ②文化与经济相互交融
③文化建设是当前各项工作的中心 ④文化的发展决定着经济的发展

根据短文理解完成下列各题。
C
    Tom is a junior high student. He is good at some subjects but his favourite subject is chemistry. Yesterday he met some trouble when he had his chemistry class.
    At that moment, Tom was doing an experiment in class. He tried twenty times, but he couldn't succeed. So he decided to stop doing the experiment. He felt really unhappy.
    His teacher came up to him and asked why he was unhappy. Tom said, "All my work is in vain (白费力气). I fail twenty times and I get nothing."
    Tom's teacher touched Tom's head with a smile. He said to Tom, "Oh, you do a lot and you can get a lot from the mistakes. At least, you know that there are twenty ways you can't use to do this experiment."
    After hearing the teacher's words, Tom became excited. He kept doing the experiment, improved his methods, and he succeeded at last.