情景匹配。
①Where are my warm clothes? ____ A. Sometimes it's cold.
②I can't find Mum. ____ B. She's in the kitchen.
③Is spring cold? ____ C. They're on the sofa.
下列各句中,加线词语解释有误的一项是( )
PM2.5是指大气中直径小于或等于2.5 μm的颗粒物,也称为可入肺颗粒物。大城市PM2.5主要来自汽车尾气排放。会加剧PM2.5污染的因素有( )