单选题 Compared with "paperbacks", as is suggested in this passage, "proper" books are ______.

A、 more costly
B、 more valuable
C、 more difficult to read
D、 more enjoyable to read

【正确答案】 A

【答案解析】[精解] 题干意为“与文中的‘paperbacks’相比较，‘proper’books是…”。该题为细节题。由第一段最后一句“They still continue to buy‘proper’ books，too，on good paper and bound between hard covers．”可以看出“proper”books是很昂贵的。