When it comes to “empty-nest syndrome(综合症)”, parents are advised to _______regular contact with children through phone calls, emails, texts or video chats.

A．substitute

B．sacrifice

C．associate

D．maintain

关于小儿喂养，错误的方法是（）

A.奶粉配制按重量1∶8

B.代授法适合将要断奶的婴儿

C.母乳喂养可按需哺乳

D.辅食添加应循序渐进

E.人乳喂养可延长至8个月再添加辅食