鼻咽癌发病高峰年龄为()。
A.10岁~20岁
B.20岁~30岁
C.30岁~40岁
D.40岁~60岁
E.60岁~70岁
参考答案:D
Your family are going _____ vacation. Please leave a massage _____ your best friend Sandy.[ ]
A. on; to
B. on; for
C. for; to
D. for; with
淘宝网的电子商务平台模式为()。
A、B2C(business-to-consumer)、B2B(business-to-business)
B、B2C(business-to-consumer)、C2C(consumer-to-consumer)
C、P2B(person-to-business)、C2C(consumer-to-consumer)
D、P2B(person-to-business)、B2B(business-to-business)