设有文法: W→AO A→A0|W1|0 将它改写后消除左递归后的文法是()。

题型:单项选择题

问题:

设有文法:
W→AO
A→A0|W1|0
将它改写后消除左递归后的文法是()。

A.W→A0
A→0A'
A'→0A'|01A'|ε

B.W→A0
A→A0 |A01| 0

C.W→A0
A→0A'
A→0A'|01A'

D.以上均不对

考点:计算机软件水平考试中级软件设计师中级软件设计师上午试题
题型:单项选择题

These days, many passers-by always spot a beggar on the Jiaochangkou Street in Yuzhong District of Chongqing in southwest China.

The beggar’s name is Xia Haibo, and he was born in Meihe Village, Tianmen City of Hubei Province. Being 25 years old, he is quite a special beggar in some ways — he doesn’t beg on his knees, as other beggars do when begging. Rather, he often stands in the crowded street, either reading a book or thinking about something carefully. He also started a blog on the Internet which has been clicked more than 500,000 times. He likes reading — he has read many classical Chinese poems. He has kept writing and recently, he has planned to publish his writings.

In 1998, Xia entered Tianmen Middle School as the best student in his town. However, a year before he took the college entrance examination, he came down with a high fever and was later diagnosed (诊断) as having rheumatoid arthritis (类风湿性关节炎). In order to treat his disease, his father borrowed 60,000 yuan from relatives and friends. However, with this money, he didn’t recover from the disease. He did not want to become a burden (负担) to his family any more. So in July, 2006, he left his hometown and went to Wuhan to make a living by begging.

Begging has become a job to Xia now. However, he doesn’t plan to go on living like this. “By July 24, 2008, when I have been begging for two years, I will stop my begging life. I promise,” he said.

It is his plan that by using the money he “earns”, he will rent a small shop in his hometown and keep on writing in his spare time.

Right now, he is trying to finish a book of his own. The book, called Love Is With Me, tells about the people who helped him during his begging life.

小题1:The underlined word “spot” in the first paragraph is closest in meaning to “______”.

A.forgive

B.record

C.beat

D.notice小题2:When did Xia Haibo get the serious illness?

A.In 1998.

B.In 2001.

C.In 2000.

D.In 2006.小题3:How does Xia beg in the street?

A.He begs on his knees in the street.

B.He writes Chinese poems for those who like poems.

C.He reads or thinks while standing in the street.

D.He teaches people how to surf the Internet.小题4: Which of the following is NOT true about Xia Haibo?

A.His dream is to have his book published.

B.He will not stop begging until he earns enough money for his future life.

C.He is writing a book to express his thanks to those who helped him.

D.He will keep writing while running a small business.

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