( )是我国旅游业的徽志。
A．天坛祈年殿
B．大熊猫
C．万里长城
D．马超龙雀
参考答案：D
—Jim can't go hiking with us, he has a fever and lies in bed.
—_____[ ]
A. I'm sorry to hear that.
B. Really?
C. Why?
D. Great!
（）年哈里.斯托克曼发表的“利用反射功率的通讯”奠定了射频识别RFID的理论基础。
A.1948
B.1949
C.1960
D.1970
