六淫邪气中，火、燥、暑共同的致病特点是
A．上炎B．扰神C．动血D．耗气E．伤津
参考答案：E
It is never harmful _____ you to be polite and gentle to others and ______, as is often the case, you can get what you want. [ ]
A. to; thus
B. for; thus
C. of; therefore
D. with; however
已知f(x，y)在(0，0)点连续，且
则下列结论不正确的是 (A) f(x，y)在(0，0)点可微． (B) fx(0，0)=-2． (C) fy(0，0)=1． (D) fx(0，0)和fy(0，0)都不一定存在．
