a．The question mark is used after a direct question．Note that it is also used after a short direct question that follows a statement．

问号通常用于直接疑问句，但当用陈述句来表示疑问时，也可以在句尾用问号。

Who has the order from Owens Chemicals?

This disk drive is expensive，isn't it?

All these word processors come with a one-year warranty，don't they?

b．When a series of questions is included in one sentence，use a question mark after each question．

当一句话中包括一连串的问题时，通常每个问题后都要加上问号。

Is she still planning to travel to England?to Japan?to Germany?