红细胞冷抗体最活跃温度是（）
A.0℃
B.4℃
C.8℃
D.12℃
E.16℃
参考答案：B
四位同学讨论某个化学方程式的场景。他们所描述的化学方程式是
The conference has been held to discuss the effects of tourism________the wildlife in the area.[ ]
A. in
B. on
C. at
D. with
