一个口袋中有红球、白球共20个,这些球除颜色外都相同,将口袋中的球搅匀,从中随机摸出一个球,记下它的颜色后再放回口袋中,不断重复这一过程,共摸了300次球,发现

一个口袋中有红球、白球共20个,这些球除颜色外都相同,将口袋中的球搅匀,从中随机摸出一个球,记下它的颜色后再放回口袋中,不断重复这一过程,共摸了300次球,发现有120次摸到红球,则这个口袋中红球的个

查看答案

You should put_____ “s” at the end of this word.

You should put_____ “s” at the end of this word.

查看答案

The reason ____he was absent from the meeting was ____his car broke down on the

The reason ____he was absent from the meeting was ____his car broke down on the way.

查看答案

Mr. Smith______ Chinese for two years. Hes much better at it. Now.

Mr. Smith______ Chinese for two years. Hes much better at it. Now.

查看答案

There ________ some children in the classroom. ( )

There ________ some children in the classroom. ( )

查看答案