填空题 《复合题被拆开情况》 If you happen to be shopping in the Ginza district of Tokyo, you might get a message on your mobile phone telling you which of the shops you’ re near has a sale on at the【C1】mo________. But do the shops know how to contact you? How do they know where you are?
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【正确答案】 1、helpful    
【答案解析】该句的意思是“如果你想找到你丢失的狗或者研究蚂蚁的移动路径，RFID是非常有帮助的”。此处考查系表结构，应填入所给词的形容词形式。故填入helpful。