单选题 After the passage the author will talk about______.

A、 the principles of designing lenses
B、 techniques of making contact lenses
C、 the design of photographic lenses
D、 styles of lenses

【正确答案】 C

【答案解析】[参考译文]接着这段文章之后，作者可能会谈到 [试题分析]此题为推测作者下一步写作内容的题。 [详细解答]第一段的最后一句说“this article will be concerned only with the design of photographic lenses”．故C正确。contact lenses隐形眼镜。