少年期的思维发展水平属于（）。
A.感知运动阶段
B.前运算阶段
C.具体运算阶段
D.形式运算阶段
参考答案：D
---He is a very hard-working student.
---________. As far as I know, he often burns the midnight oil.
A．You can say that again
B．Absolutely not
C．Heaven knows.
D．No way
婴幼儿食品是指满足婴幼儿（）所需的食品。
A、断奶需要
B、正常生长发育
C、添加辅食
D、满足主食
