Nowadays, many people walk to work _____
题型：选择题
问题：
Nowadays, many people walk to work _____ Copenhagen Conference calling for living a low-carbon lifestyle
to cope with global warming. [ ]
A. in relation to
B. in response to
C. in addition to
D. in opposition to
，发生反应的化学方程式是 
；
一种物质的方法和现象是 。