It seems to me that it would be wrong to ban testing on animals for vital medical research until equally effective alternatives have been developed.问题1:为何这里用it would be，可以直接用 it is吗？如果可以的话，区别在什么地方呢？问题2:为何这里使用have been done...
请教一下：含有情态动词may, might的句子如何变反意疑问句？You may go only on certain conditions. 你只有在一定条件下才能去。He may have been mistaken about what he saw. 他可能看错了。He might wake up at any moment. 他随时都会醒过来。They might easily ...
Thus, in the American economic system it is the demand of individual consumers, coupled with the desire of businessmen to maximize profits and the desire of individuals to maximize their incomes, that together determine what shall be produced and how resources are used to produce it.句子分析及...
...res none of the enthusiasm or interest that Americans afford trains, jets, and even bicycles. Dr. Christopher Wilk is a
member of a small group of elevator experts who consider this a misunderstanding.
Without the elevator, they point out, there could be no downtown skyscrapers or
tall buildings, an...
...ch will grow more
popular with time, and if the past is any indication, he maybe right: Since
1982, membership in the American Holistic Veterinary Medical Association has
grown from 30 to over 700. “Sometimes it surprises me that it works so well,”
he says. “I will do anything to help an anim...
It is not uncommon for there ( ) problems of communication betwee the old and the young.A. to beB. being答案A. to be我个人分析（不一定正确，麻烦老师指教）for there to be problems of... there可分析并看作不定式的逻辑主语（there在许多方面具有主语的语法特...
...可以的话，麻烦帮忙解释一下这句话，是习语还是什么？And should it not do so,that too would be valuable information. Scientists often make the case for the value of negative results. By making it so much harder to believe in longstanding theories,this would be the mos...
Andit is providing to be an increasing powerful tool in encouraging people to
purchase. 这是北京高考真题阅读理解中的一句话，这里的 it is providing that是什么用法， providing在这里该怎么理解呢？
...er History
Museum in America. It has information about different computers and who
invented them. The old computers were much bigger. It's believed that
technology has progressed in such a rapid way! I've also learned that there was
a special computer. It could play chess even better than humans. I ...
...ts effects, such as those that influence serotonin production. Or your dad may have had the same gene and taught you at a young age how to deal with it, perhaps by his good example. Maybe you work in a setting that doesn’t require a lot of “farming” chores. You could have the traits that come ...
章振邦的新编高级英语语法679页：But this fault, if itbe a fault, has been caused by earnest wish to give as much of Shakespeare's own words as possible.1) if itbe a fault 是什么意思？ 为什么不是if it is a fault ? 这里be什么用法？2）句中，为什么不是as man...
... currently
interests their fledging adult (as naive or ill conceived as itmay seem) while
becoming a partner in exploring options for the future.我的理解跟黄皮书的理解不一致，for whatever currently interests their
fledging adult我以为是状语（修饰exhibit），但解析是定...