(单选题)

In the passage, the answers can be found to all the following questions EXCEPT ______.

A.How does a swimmer get ready for a crossing

B.Why is timing so important to a channel swimmer

C.How far should a swimmer swim in crossing the channel

D.What risks does a swimmer run in crossing the channel

参考答案：C

参考解析：

概括归纳题。从文中第一段可知，横渡海峡需要各种准备，如何准备都有陈述，A项正确；从文中第三段可知为什么时机很关键，B项正确；从文中最后两段可知，哪怕做好了充分准备，也有可能面临各种危险，D项正确。而C项意为根据最后一段“Some swimmers are swept so far of course that the swim from 30 to 45 miles in the process.”由于海浪、潮汐等各种因素，一个游泳者需要游多远才能横穿海峡，无法确定。根据题干，C项问题无法回答，故选C。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语