He picked up the newspaper and stared _________ the headline(标题).
查看答案
Where in the world were you when I was struggling _______ my life?
She's still _______ work. I'll ask her to call you when she gets home.
若f(x)在[a,b]上连续，则在(a,b)内必有()
A. 导函数
B. 最大值与最小值
C. 极值
D. 原函数
下列社会保险项目中，不需要个人缴费的是（）。
A. 养老保险
B. 医疗保险
C. 失业保险
D. 工伤保险
微信支付 
支付宝支付