今年,“PM2.5”一词备受关注。PM2.5是指大气中直径≤2.5微米的颗粒物,由于它粒径更小,所以对人体健康的影响更大。一般而言,PM2.5主要来自化石燃料的燃烧、有机物的挥发等,下列途径中产生PM2.5相对较少的是( )
( ) ________are sitting over there. A. TheirB. TheyC. Theirs
( ) David likes________ modelplanes, ________Mike doesn’t. A. make; butB. making; butC. make; and
( ) Would you like________after you finish the school? A. a teacherB. be a teacher C. to be a teacher
( ) It’s the third day of the week. It’s________. A. MondayB. Wednesday C. Tuesday
( ) She________to school at7:40 every day, but yesterday she________ to school at7:00. A. goes; goesB. goes; wentC. went; goes