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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.
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【单选题】在纯随机抽样条件下,若抽样比例都为36%,则不重复抽样的抽样平均误差比重复抽样的抽样平均误差小( )。
A.
20%
B.
36%
C.
80%
D.
64%
【单选题】在纯随机重复抽样条件下,抽样平均误差( )
A.
与标志变异指标的大小无关
B.
与总体标准差成正比关系
C.
与总体方差成正比关系
D.
与样本单位数成反比关系
【单选题】在纯随机重复抽样条件下,如果将样本单位数扩大为原来的4倍,则抽样平均误差( )。
A.
扩大2倍
B.
缩小1半
C.
缩小1倍
D.
扩大4倍
【判断题】定积分称为常见积分或正常积分,广义积分也称为反常积分。
A.
正确
B.
错误
【判断题】在纯随机重复抽样条件下,如果将样本单位数扩大为原来的4倍,则抽样平均误差 缩小一半.
A.
正确
B.
错误
【单选题】在纯随机重复抽样条件下,如果样本单位数扩大1倍,则抽样平均误差误差将()
A.
扩大到原来的4倍
B.
扩大到原来的2倍
C.
缩小到原来的倍
D.
缩小到原来的
【判断题】反常积分由于积分上下限有 ,所以反常积分的值一定也是
A.
正确
B.
错误
【单选题】在纯随机重复抽样条件下,重复抽样的抽样平均误差是不重复抽样的( )
A.
1
B.
2
C.
3
D.
4
E.
5
【判断题】设函数 在区间 上连续,如果反常积分 与反常积分 至少有一个收敛,那么称反常积分 收敛。
A.
正确
B.
错误
【简答题】判定下列各反常积分的收敛性,如果收敛,计算反常积分的值:
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