窦性心动过速的频率为（）
A.>160／min
B.>80／min
C.>120／min
D.60～100／min
E.>100／min
参考答案：E
每天早、中、晚餐的能量摄入比例正确的是[ ]
A．30%、40%、30%
B．40%、30%、30%
C．20%、40%、40%
D．30%、30%、40%
— _____ have you been learning English?
— I have been learning English for six years. [ ]
A. How long
B. How often
C. How far
