150千克比200千克少____克。
世界上华人和华侨分布最集中的地区在( )
— Tom, look at those two girls!
—Oh, they look_________ because they are twin sisters.
如图所示,小丽同学撑一把雨伞在雨中行走,当一阵大风吹来,伞面可能被“吸”得严重变形.下列有关这一现象及其解释正确的是( )