题目

20世纪科学飞速发展，但仍有许多问题尚未解决。有待化学科学解决的难题是(   ) A.甲烷分子结构的确定                     B.高炉炼铁 C.常温常压合成氨                           D.可充电干电池的制作 答案：【答案】C 【解析】目前合成氨是在高温、高压下进行，有待化学解决的难题是合成氨在常温、常压下进行。Forgiving someone who has hurt you or let you down is never an easy thing. Several new studies, however, say that it could have a lot of health benefits. When you think of forgiveness, you probably don’t think of it as being a health or medical problem. Studies from Stanford University, on the other hand, show that something like anger can change your well-being.When cartoon book characters like the incredible(难以置信) Hulk get angry, they change colours and often gain special power. In the real world, anger is less obvious and may be more dangerous. That’s why Professor Fred Luskin, founder of the Stanford Forgiveness Project and author of Forgive for Good, says holding on to anger and hatred can harm your physical and mental health. Two new studies seem to show the same idea.The studies find that people who are able to forgive feel less stress, less back pain, and less depression（沮丧）. They also have fewer headaches, lower blood pressure, and fewer problems on sleeping.So it doesn’t matter if your anger is caused by the traffic or other things. Learning to let it go is important. Techniques such as deep breath or thought can help. Or just ask yourself if it’s worth hurting yourself by staying angry with someone else. Forgiveness does not mean that you simply accept what happened and say it’s OK. Instead, it’s a way of making peace with yourself about what happened in the past. 49. The author of the passage tries to make his viewpoint clear ______.   A. by raising his own examples.                 B. based on his own experience.   C. by mentioning some studies.                 D. by mentioning some typical patients.50. The example of the cartoon book characters is taken in the passage to____.   A. support the viewpoint that anger and hatred harm physical and mental health.   B. introduce a famous expert.   C. let the reader know the different colours of cartoon faces.   D. show how to control one’s temper.51. The underlined phrase “holding on to” in this passage possibly means“__”.   A. removing.      B. keeping up.       C. getting rid of.      D. learning about.52. The best title for this passage is probably _______.    A. Forgiveness.                                   B. Forgiveness Is Good for Health.  C. A Secret to Keeping Health.               D. Anger Is Bad for Health.