市政协开展工作的主要方式有( )
A．召开会议
B．提出提案
C．视察
D．专题调研
E．反映社情民意
参考答案：A,B,C,D,E
下列关于血红蛋白结构与功能的叙述正确的是
A．亚基间为共价键连接
B．氧饱和曲线是矩形双曲线
C．O2是血红蛋白的别构激活剂
D．1个血红蛋白分子结合1个O2
E．辅基血红素中为Fe3+
Don't refer to the dictionary every time you come across a new word as sometimes its meaning may be _____
clearly in a given context. [ ]
A. picked out
B. ruled out
C. brought out
D. taken out
