[单项选择]An inventor can generally make a big profit if he ______ his or her invention.
A. publishes
B. keeps secret
C. patents
D. sells

[单项选择]An inventor can generally make a big profit if he _________ his or her invention.
A. publishes
B. keeps secret
C. patents
D. sells

[单项选择]You can make a big difference in a medical emergency if you know the right thing to do.
A. 假如你知道该怎么办的话，那么你在需要医疗抢救中就会表现得非常突出。
B. 如果你知道应该做什么的话，那么在医疗紧急事件中你就会做得很好。
C. 假如你知道该怎么做的话，你便可以在需要医疗急救时起到至关重要的作用。
D. 如果你知道应该做什么的话，那么在医疗抢救中你就会干得和现在完全不一样。

[单项选择]Who can make big money in the new century according to the passage
A. Retirees who are business-minded.
B. The volunteer workers in retirement homes.
C. College graduates with an MBA or law degree.
D. Professionals with a good knowledge of gerontology.

[单项选择]

Man has a big brain. He can think, learn and speak. Scientists used to think that man are different from animals because they can think and learn. They know now that animals--dogs, rats and birds--can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or hungry. or unhappy. Apes are our nearest cousins. They can understand some things mole quickly than human beings, and one or two have learned a few words. But they are still different from us. They cannot join words and make sentences. They cannot think like us because they have no language. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child can. speak his own language vet well when he is four or five--but no animal learns to speak. How do children learn Scientists do not really know. What happens when w
A. why animal can learn
B. why man has a big brain
C. why animal cannot speak
D. why man is different from animals

[单项选择]The elephant is _____ big that he can't get into the room.

[单项选择]The elephant is ______ big that he can't get into the room.

[单项选择]He now can vote, he can enter into financial contracts, and he is _________to run for public office.
A. attributed
B. entitled
C. credited
D. presented

[单项选择]______ fails to see this will make a big mistake.
A. Whoever
B. Whatever
C. Anyone
D. Who

[单项选择]Using the rules for IPv6 addressing, how can t he address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?（）
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F:9C0::123A:121B
D. 2031::240F:::09C0:123A:121B

[单项选择]What preparations did Thomas make before he started his business
A. He stayed at home
B. He borrowed money from a bank.
C. He made investigations and drew up a plan
D. He wrote a book.