15．D。根据题意，这里表示“自己照顾自己“，故选yourself 。

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Suppose(假设) you are going to Boston, and you 　1　 　the city

before. If someone 　2　 　you about the interesting places in the city, you 　__3　 　to get some ideas of what you will see. But don’t have a 　4__　 　idea of where these places are or of how to find 　5　 . However, 　6__　 　someone has a map of the city and 　7　 　you the main roads and buildings, you may say, “ Oh, now I see . I can find my way with 　8__　 　trouble at all ”. Working in math is somewhat(有点儿) like trying to find your way 　9　 　a new city. Perhaps the words may tell you some 　　　information and you have 　10　 　it, but you can’t see any clear road 　11　 　the answers.

Maybe you 　12　 　a kind of map of the main roads in maths 　13__　 　you find your way. Explore(探究)what lies in maths, and 　14　 　to find

the main roads. They will 　15　 　you to the answer. If you can find the “map”, the maths problems will be easily worked out.

14．B。根据题意，如果别人关心你，你就会加倍珍惜自己，故选better。

13．B。根据题意，心情好，有助于身体健康。这里用动名词短语充当主语，happy是形容词，前面应添上be动词，故选 being 。

12．A。根据上句中“good news”, 可以知道这里应该是长寿，又因为句中有than, 可以知道应填比较级，故选longer。

11．C。make friends为固定结构，意思是“交朋友”。

10．A。根据常识，思念朋友时，我们可以通过打电话和写信来和朋友联络, 故选call。

9．B。根据语境，朋友离开应是很难过的事情。故选sad。

8．D。根据上半句they will make up可以知道产生分歧的朋友也会和好如初。故选friends。

7．B。既然人与人之间总有不同之处，所以朋友有时也会有矛盾,故选sometimes。

6．C。根据句意，世界上没有两个人是相同的，故选just the same。