小儿开始认识母亲，见奶瓶表示喜悦的年龄是（）
A.2个月
B.3个月
C.4～5个月
D.6～7个月
E.1～1岁半
参考答案：C
–Have you received Jack’s plan?
--Yes, but I don’t think his plan is _____.
A．worth being considered
B．worthy to be considered
C．worthy of considering
D．worth to be considered
《邮政法》规定邮政企业履行（）的义务。
A.服务民众
B.普遍服务
C.有偿服务
D.无偿服务
