[填空题]We didn’t know all the circumstances, so ________________ (狂测他为什么辞职是没有意义的).

[简答题]All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds, and which could be written down.

[简答题]We all know that we should take better care of ourselves, relax more, and have more fun at work (and elsewhere, as well) , but it’s easy to overlook the opportunities to do just that be cause of the daily work priorities that consume our lives. Here are some ideas for learning to take action in your work life.

[填空题]

We still do not know all of the reasons why babies are born sick or with major disabilities. But we do know (31) . One baby, maybe more, (32) of one hundred is born with a serious genetic problem. Gene therapy (33) a very real possibility of correcting many of these disorders. It could transform — indeed, it already has — lives that are doomed (34) the pain and anguish of chronic illness. But scientific advances can also generate misunderstanding and fear. The Salk polio vaccine, so closely identified (35) the March of Dimes, was one of the most important medical gains of our time. It was safe. It worked. But (36) earlier vaccine used "live" viruses that caused fatalities, researchers (37) to overcome public apprehension.
Some critics are concerned that gene therapy will be abused create "super" humans. (38) are disturbed about possible disclosures of personally sensitiv