体内钾的主要排出形式是
A．汗液
B．尿液
C．唾液
D．肠液
E．淋巴液
参考答案：B
We can't complain that children are cheating in examinations ______ adults themselves have set such a bad role model for them to follow.
A．because
B．unless
C．when
D．though
为什么要以经济建设为中心？
