通常把正常人取得最佳健身效果的心率区确定为（）次/分之间。
A、120-170
B、120-140
C、160-170
D、140-170
参考答案：B
Giving small children some money as a gift during the Spring Festival is a common ______ in China, which may seem strange to foreigners?
A．sense
B．practice
C．ground
D．habit
徽商银行信用卡额度上调，原则上最高不超过原信用额度的（）
A.50%
B.100%
C.150%
D.200%
