鸡头部皮肤有痘疹或结痂常见于()。
A.传染性鼻炎
B.传染性支气管炎
C.鸡痘、冠癣
D.盲肠肝炎
E.以上都不是
参考答案:C
曲线y=sinx+ex在点(0,1)处的切线方程是( )
A.x-3y+3=0
B.x-2y+2=0
C.2x-y+1=0
D.3x-y+1=0
The little girl trembled ___________ fear when she found a snake on the ground. [ ]
A. in
B. with
C. for
D. over