以下商品所使用的商标必须注册的是（）。
A.清凉饮料
B.雪茄烟
C.彩电
D.空调
参考答案：B
Yesterday afternoon I _____ a friend of mine most of time. [ ]
A. was visiting
B. was visited to
C. had visited
D. would has visit
流行性出血热发热期体征包括()
A.上臂潮红
B.眼结合膜出血
C.颜面潮红
D.颈部发红
E.胸部发红
