以下哪一项不是忠诚客户的标志()
A.持续购买
B.选择购买
C.相关购买
D.推荐购买
参考答案:B
Everyone is supposed ________ a seat belt in the car.
A. wearing B. to be worn D.wear D. to wear
水痘的病原体是()
A.HIV
B.VZV
C.CMV
D.HSV
E.EAD