（）细胞有辩色能力。
参考答案：视锥
— How many theatres are there in your town?
— _____________.[ ]
A. It's four
B. They're three
C. Sorry, I don't know
法国著名的巴黎（PERRIER）矿泉水，是（）
A、无色无味
B、有汽有味
C、有汽无味
