题干
In order to let more people pay attention to their plan, they ________ some signs on the wall.
A：put off
B：put up
C：put away
D：put out
答案(点此获取答案解析）
B
In order to let more people pay attention to their plan, they ________ some signs on the wall.
A：put off
B：put up
C：put away
D：put out
，CO和H2按物质的量之比1：2可以制得G，有机玻璃可按如图路线合成：