下列说法正确的是（） A．相等的圆心角所对的弧相等 B．

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问题选择题

下列说法正确的是（　　）

A．相等的圆心角所对的弧相等

B．相等的圆周角所对的弧相等

C．等弧所对的圆周角相等

D．在同圆或等圆中，圆周角等于圆心角的一半

答案

A、必须在同圆或等圆中，故该选项错误；

B、必须在同圆或等圆中，故该选项错误；

C、圆周角定理的推论，故该选项正确；

D、圆周角和圆心角必须对的是一条弧，故该选项错误．

故选C．

单项选择题

组态中，（）属性必须是唯一的

A、name

B、点细目

C、卡件位置

听力题

根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。（每空一词）

小题1:He will know the result of the exam _______(大约)the middle of the month.

小题2:Don’t be_______ (耐心的)! Please think about what I said first.

小题3:Jack is very busy. Has he (回答)to your last e-mail?

小题4:Can you spend some time (解释)the project to us in detail?

小题5:The Chinese Ping-pong team won all of the four gold medals __________(成功) in the 30th Olympic Games in London.

小题6:The boring speech makes the little boy feel _________ (sleep).

小题7:Wearing red can help you when you have trouble in making _______ (decide).

小题8:The whole class is____________ (divide)into four groups．

小题9:We’ve missed the last bus! I’m afraid we have no __________(choose) but to take a taxi.

小题10:Don’t keep your worries to (you) , Jim and Tom．