( )What does the idiom tell us?
A. We should think only about the gains(收获) in front of us.
B. We should think only about the danger behind us.
C. We should think not only about the gains in front of us but also the danger behind us.

【解析】：
这是一道阅读理解题，主要考查学生对成语故事内容的理解以及从中得出的道理。解题的关键在于仔细阅读故事内容，理解故事所传达的含义。故事讲述了吴王想要攻打楚国，一个年轻人在吴王的后花园里用弹弓转来转去，通过讲述蝉、螳螂、黄雀只顾眼前利益，不知身后危险的故事，让吴王明白了不能只看到眼前的利益，而忽视身后的危险，从而放弃了攻打楚国的计划。
【答案】：
C