参考答案

正确答案：C
解析：细节辨认题。根据第一段第一句 "Many students trying to increase their effective reading speed become discouraged when they find that if they try to race through a passage faster, they fail to take in what they have read. "和第二段最后一句 "If there are, on average, more than five or six words on each page that are completely new to you, then the book is not suitable for reading-speed improvement"可得出答案为C。