学前期是儿童语言获得的()时期。
参考答案:关键
Chinese athletes did a great job in the Winter Olympics in Canada. It can encourage post-90s(90后) .[ ]
A. work harder
B. worked harder
C. working harder
D. to work harder
A320飞机(2343-2352)的发动机型号为()
A、V2500
B、GE90
C、CFM56-3
D、ERJ