与便秘发生有关的脏腑有
A．大肠
B．脾胃
C．肝
D．肺
E．肾
参考答案：A,B,C,D,E
I have too _____ homework this week. [ ]
A. a lot
B. much
C. many
D. a little
可致白血病的为
A．紫外线 B．可见光 C．红外线 D．X射线和γ射线 E．微波
