问题
选择题
—_________ does Mary play sports?
—Once a week.[ ]
A. How long
B. How many
C. How often
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—_________ does Mary play sports?
—Once a week.[ ]
A. How long
B. How many
C. How often
答案：C
代表阿伏加德罗常数的数值。下列有关
分子数为
个