许多电子商务企业在产品生命周期进入成熟阶段后，往往采用（）策略。
A、免费
B、高位定价
C、低位定价
D、个性化定价
参考答案：C
Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A．it was invent
B．was it invented
C．it was invented
D．it invented
症见发热，微恶风寒，头身困重，肢体倦怠，苔白薄腻，脉浮濡数，方用（）
A.卫分宣湿饮
B.藿朴夏苓汤
C.银翘散
D.桑菊饮
E.桑杏汤
