问题 单项选择题

一个事务执行过程中,其正在访问的数据被其他事务所修改,导致处理结果不正确,这是由于违背了事务的 而引起的。

A.原子性
B.一致性
C.隔离性
D.持久性

答案

参考答案:C

解析:

[分析]:
一个事务执行过程中,其正在访问的数据被其他事务所修改,导致处理结果不正确。也就是说,该事务在执行过程中受到了其他事务的干扰,违背了事务的隔离性。

阅读理解

Two worlds come together

Imagine landing in a foreign country where you cannot speak the language, understand the culture and don’t know anybody. Wouldn’t it be nice to have a friend who could help you out?

John Smith, an English explorer who landed in America in 1607, found the best friend ever. She was a Native American named Pocahontas (1595-1617). And she did more than teach Smith the language: she saved his life, twice.   

Smith was captured(捕获) by members of Pocahontas’s tribe (部落) and was going to be killed. But for some reason, the Chief’s daughter, Pocahontas, felt sorry for Smith (who was probably the first white man she had ever seen) and threw her body over his to protect him. Smith returned safely to the small village he was living in.

During the winter the English settlers did not know how to get food from nature. Pocahontas often brought food for Smith and his friends.

A year later Pocahontas’s father tried to kill Smith again because the Native Americans were very scared the English would try to take over their land. Pocahontas warned him and he was able to escape.

Later she became a Christian and eventually married an Englishman named John Rolfe.

She spent the last year of her life in London.

Pocahontas has become an American legend. Her life story has been re-created in many books and films, including Disney’s 1995 film, Pocahontas.

One of the reasons she is so popular is that many Europeans look at Pocahontas as an excellent example of how a minority can adjust into the majority. Pocahontas is also respected because of her selfless love. She proved that people can be kind and loving even to people of a different race or culture. John Smith was very different from Pocahontas but she could see he was a good man and that was all that mattered. No race or country owns goodness, love and loyalty.

小题1: What difficulties might early European settlers meet in America EXCEPT ________?

A.the fierce conflict with Native Americans

B.bad-tempered natives who enjoyed killing

C.unfamiliarity with a foreign land

D.lack of food in winter小题2: Pocahontas saved John Smith twice because ______.

A.he was the first white man she had ever seen in her life

B.she wanted to become a Christian and marry an Englishman

C.she believed in general kindness even to people of a different race

D.she was on the settlers’ side and against her cruel father小题3: According to the text, Europeans think Pocahontas _____.

A.was brave to break away from her own tribe

B.set a good example for other natives to accept the white settlers

C.was a selfless Christian who can love her enemy

D.was open to a more advanced culture小题4: What can we infer from the passage?

A.The battles between early settlers and Native Americans resulted from their fighting for land.

B.The Europeans think the early settlers should have learned to adjust to the local cultures.

C.The creation of America is based on the settlers’ victory over the Native Americans.

D.People from different cultures can never really get along well with each other.

判断题