We keep in touch _____ writing often. [ ]
A. with
B. of
C. on
D. by
答案：D
He will never give up________difficulties he has. [ ]
A. no matter how much
B. no matter how
C. no matter how many
D. no matter how big
下列各项，属于脑膜刺激征的是
A．布鲁津斯基征
B．查多克征
C．巴宾斯基征
D．戈登征
E．拉塞格征
