Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and disease. So far, this has only remained a dream. Many people have wondered whether it would be possible to find a way to preserve human bodies, and what would be the best way. It has long been known that meat of fruit can be kept fresh for long periods by freezing; in ancient China, for example, food was stored with ice to keep it fresh. This method could also be useful for preserving humans. However, most living beings that exist under warm conditions die when frozen. This is because of the harmful effects of freezing ice crystals , which not only are larger than the volume of the water originally in the cells, but also form sharp cutting shapes that harm the cells. In the 1940s Dr B.J. Luyet and a group of scientists in England were working on the problem of freezing cells without damaging them. Since the harm caused by ice crystals was the main cause of damage, Luyet suggested removing some or all of the water from the cells before freezing them. Using living cells form chicken, Luyet and his assistants discovered that they could partly dry the chicken cells, using a mixture of the white part of an egg and glycerin . Some success was obtained. The chicken cells were dried, frozen for a period of time, and then carefully unfrozen. Almost all the cells recovered when they reached normal temperatures. Since then, the cooling of whole animals to a temperature far below freezing point for later unfreezing has become more of a possibility, and the glycerin method would probably be used to accomplish this. When this can be done completely and successfully, science will have moved much closer to its aim of freezing and storing incurable patients until the day they can be cured. According to the text, freezing _ . A) is harmful to living cells B) is the best way of preserving food C) reduces the volume of water in living cells D) is a way of removing water from living cells
A
Any day we wish;we can discipline ourselves to change it a11.Any day we wish;we can open the book that will open our mind to new knowledge.Any day we wish;we can start a new activity.Any day we wish;we can start the process of life change.We can do it immediately,or next week,or next month,or next year. We can also do nothing.We can pretend rather than perform.And if the idea of having to change ourselves makes us uncomfortable,we can remain as we are.We can choose rest over labor,entertainment over education,delusion over truth,and doubt over confidence.The choices are ours to make.But while we complain about the effect,we continue to nourish the cause. As Shakespeare uniquely observed,"The fault is not in the stars,but in ourselves.''We created our circumstances by our past choices.We have both the ability and the responsibility to make better choices beginning today. Those who are in search of the good life do not need more answers or more time to think things over to reach better conclusions. They need the truth .They need the whole truth .And the responsibility to ks5unothing but the truth. We cannot allow our errors in judgment,repeated every day,to lead us down the wrong path. We must keep coming back to those basics that make the biggest difference in how our life works out.And then we must make the very choices that will bring life,happiness and joy into our daily lives . And if I may be so bold to offer my last piece of advice for someone seeking and needing to make changes in their life--If you don't like how things are,change it !You're not a tree.You have the ability to totally transform every area in your life -- and it all begins with your very own power of choice. In the author's opinion,if. you want a good life,what you need most is _ . A) self confidence B) good choices C) strong wills D) the truth
B
Q: Marriages improve after children grow up and move out,according to an academic study, which suggests an "empty nest" is not always a bad thing. Popular wisdom has it that parents' relationships may suffer once their young fly the coop, because they feel they have lost their purpose in life.However, a new study by researchers at the University of California, Berkeley, has found that many couples actually feel happier when their children leave home because they are able to enjoy spending time together. In total,123 American mothers born in the 1930s were tracked for 18 years and asked to rate their satisfaction levels shortly after marrying, when they were bringing up babies, once their children reached their teenage years and finally at age 61, when almost all had "empty nests". Although not all said they were happier in general, most claimed their marriages had improved since their children had left home. Researchers believe this is not just because the spouses were spending more time together, but because they were able to enjoy each other's company more. One of the participants in the study,which is published in the journal Psychological Science,said:"Once the kids grow up...there's some of that stress removed...that responsibility removed,so things are a little more relaxed." Psychologist Sara Gorchoff,who carried out the investigation,said: "The takehome message for couples with young children is 'hang in there'." Her coauthor Oliver John added:"Don't wait until your kids leave home to schedule quality time with your partner." However, Dr Dorothy Rowe,from the British Psychological Society,said the effects of living in an "empty nest" will depend on the parents' relationship with their children."If you're just waiting for them to leave home so you can get on with your life,then of course you'll be pleased to see them go," she said, "But if you've built your life around your children you'll be terribly lonely.For some parents,their world falls apart when their children leave." The author of the passage tends to agree that _ . A) parents should build their life around their kids B) parents should schedule quality time with each other before kids leave home C) parents' relationship with their kids has no effect on marriages at all D) parents should be pleased to see their kids leave home
A: B
*Question*
Even with the multimedia excitement of the web. Electronic Mail, email, is the most frequently used application of the Internet. Many people who have a chance to use the Internet at school, home, and work. They use the Internet for no other purposes than to send or receive emails. It's all very easy. You prepare the message, log onto the Internet, and send it. The message first goes to your Internet Service Provider's mail server, which in turn sends it to the recipient's mail server. On the way your message may go through several servers, each reading the name in order to send it to the right server. The message then remains in the recipient's mail email server until he requests it by "checking his mail". The benefits of emails are obvious: mostly it's quick. Also, many people feel that the rules for regular mails don't apply to email, making it less formal, which in turn make email easier to write and send. It's not just friends and coworkers that are receiving emails. Wherever you look, the Web is providing email addresses. This has made communication between strangers easier than ever. You can read an interesting article online and immediately send the author an email. Anyone who posts his email address on a Web page is saying he wants to receive email. There are places you can go if you don't know someone's email address. Check out Bigfoot, the Internet Address Finder, or Netscape's Email Directories for more information. Email is one of the services offered by your Internet Service Provider--a service that you're applying for every month. We can infer from the passage that _ . A) email is the only application of the internet B) if you want to send and receive emails, all you have to do is to log onto the Internet. C) many people use the Internet only for the purpose of sending and receiving email D) you can send emails to friends and coworkers but you can't make communication between strangers
**Answer**
C