问题 单项选择题

可信区间估计的可信度是指()。

A.α

B.1-α

C.β

D.1-β

E.估计误差的自由度

答案

参考答案:B

完形填空

Jody was ten years old when he decided he needed a job. He thought it might be  to keep worms(虫). He could sell them to farmers. So in    , he bought many worms. But that winter the cold weather killed all the worms because he had not put them in a     place.

The next spring Jody     again. He bought more worms. When winter came, he took them inside so they would stay warm. Many farmers bought his worms.

One day when Jody was twelve, he got   It was from State of New York. The letter said, “Everyone who   things has to pay taxes (税)!” Jody made only one dollar selling worms. But he still      to pay part of that money to the state. He told many people in his town what had  . A reporter     Jody on TV. Many people saw it and they began to write letters to the state. The letters said that the law was unfair. Finally the law was       . Children like Jody can now sell things without paying taxes to the state.

小题1:A. boring                B. lucky                C. interesting

小题2:A. autumn               B. spring                 C. winter

小题3:A. warm                   B. clean                 C. nice

小题4:A. tried                   B. waited               C. failed

小题5:A. a present             B. a letter                C. an e-mail

小题6:A. buys                    B. sells                     C. feeds

小题7:A. hoped                 B. wanted                    C. had

小题8:A. happened             B. appeared               C. followed

小题9:A. saw                    B. played with              C. reported

小题10:A. passed               B. changed                   C. moved

填空题