题目

空气中含量较多且化学性质不活泼的气体是（ ） A．氮气 B．氧气 C．二氧化碳 D．稀有气体 答案：A --- Can you help me with the bike? --- Sorry, I’m a little busy now. Read the instruction. It______, “Do it yourself”.A. speaks B. talks C. tells D. says