题干
My uncle is repairing some old bikes these days. He plans to _________ to charity.
A：give them away
B：give them up
C：take them away
D：pick them up
答案(点此获取答案解析）
A
Z(g) + M(g) + N(s) 进行过程中X的转化率随时间变化的关系。若要改变起始条件，使反应过程按b曲线进行，可采取的措施是( ) 