大气层的分层中,位于最低层,紧靠地球表面的叫什么层?()
A.平流层
B.暖层
C.散逸层
D.对流层
参考答案:D
Little Tom is too young to __________ himself.[ ]
A. have on
B. dress
C. wear
D. put on
月嫂,母婴保健师,育婴师的区别