A:旨在提高青年人的节俭意识
B:有利于扩大社会的救济面
C:极大压缩了社会消费能力
D:培养了青年人的爱家精神
— Are those shoes yours?
— No, they aren't.
— Whose shoes are they, ?
— They are Tom's.
看图,选词填在四线三格中。
pig cow grass horse sheep
可见光的波长范围为( )