天王星表面那梦幻般的蓝色其来源是（）。
A.水
B.液态氨
C.甲烷
参考答案：C
以下关于团体保险作为员工福利计划的局限性，表述不正确的是（ ）。
A．保障的暂时性
B．忽视潜在的风险
C．无法满足个人财务需求
D．无法享受税收优惠
William Sidney Porter, known as O. Henry, is most famous for（）
A. his poems
B. his plays
C. his short stories
D. his novels
