Whenever a French novel is translated into English, the edition sold in Britain should be in British English. If the edition sold in Britain were in American English, its idioms and spellings would appear to British readers to be strikingly American and thus to conflict with the novel’s setting. The recommendation is based on which of the following assumptions

A．The authors of French novels are usually native speakers of French.

B．A non-British reader of a novel written in British English will inevitably fail to understand the meanings of some of the words and idioms in the novel.

C．No French novel that is to be sold in Britain in English translation is set in the United States.

D．A British reader of a British novel will notice that the idioms and spellings used in the novel are British.

E．(E) Most French novels are not translated into both British English and American English.

伯努利方程式中位置水头是相对基准面而言的，基准面（）

A、必须是海平面

B、必须低于管线

C、只要是水平面就可以

D、只要是平面就可以