便秘总以哪项为纲：（）
A.虚实
B.寒热
C.五脏
D.六腑
E.虚实寒热
参考答案：A
It is not always easy for the public to see _____ use a new invention can be of to human life. [ ]
A. whose
B. what
C. which
D. that
根据韦纳的归因理论,能力属于( )原因。
A．不稳定的
B．可控的
C．外在的
D．内在的
