疾病发生的内在原因是（）
A.正气与邪气的斗争
B.邪盛而正未衰
C.邪气
D.正气不足
E.正衰邪盛
参考答案：D
一个圆柱的底面半径是5dm，高是2dm，则它的表面积是______dm2，体积是______dm3．
The further falling of the stock market as reported today has ______ a fresh wave of selling.
A．given off
B．set off
C．put off
D．taken off
