题目：
The resources of the library can be helpful even when we are doing something very informal, such as trying to devise a better way to measure attitudes toward music or looking for a better way to teach Johnny to (36) by two-digit numbers. The library can be (37) helpful when we are doing something very (38) , such as writing a dissertation or preparing an article for (39) publication in a national journal. In either case, our (40) should be to use the library as a useful tool to help us (41) and solve our problem.
The following sections of this chapter will describe (42) resources available in many libraries. The (43) of readers with these different resources will vary considerably. (44) . In other cases you may be completely unfamiliar with a resource. Your goal should be to become aware of what is available and to know how to use each of these resources to help you solve the problems they are designed to solve.
(45) , they often make this information available in professional journals or at professional meetings and conventions. (46) . It would often be useful to have access to such information, and this chapter will describe the indexing and retrieval services that enable us to locate such information, whether it is distributed through a formal or an informal channel.
答案：
参考答案：divide
解析：[听时猜测] teach sb. to do sth. ，此处需要填入一个动词原形。[答案要诀] 语义推断题【考频：41】。根据句子中所提到的小孩名字和空格后的“两位数字”，可知此处是指教小孩做简单的数学题目。结合录音可知应填入divide“除法，除以……”。
