个人购买健康保险是解决（）的手段之一。
A.社会问题
B.早死风险
C.养老收入
D.健康保障
参考答案：D
与亚洲隔白令海峡相望的大洲是（ ）
A．欧洲
B．非洲
C．大洋洲
D．北美洲
—Is Lucy doing homework?
—______. She is playing computer games. [ ]
A. Yes, she is
B. Yes, she does
C. No, she isn't
D. No, she doesn't
