题目内容
13．The signal of the cell-phone is poor here．That's why I can't communicate with you．分析 这里的手机信号很差．这是我为什么没有和你联系的原因．
解答 答案：signal．
根据后面why引导的表语从句可知，前面的句子强调的应该是手机的信号差，故答案为signal．
点评 首字母填空题考查的是词汇的记忆和运用能力，平时要注意积累和运用．同时还要注意提示字母．
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