雷击除了产生直击雷过电压外，还会出现（）过电压。
A.冲击
B.感应雷
C.弧光
D.闪电
参考答案：C
After the earthquake , ________food and medicine was sent there. [ ]
A. a good many
B. scores of
C. a good dedl of
D. a large number of
一期梅毒硬化性淋巴结炎的特点是（）
A.红肿
B.易破溃
C.质地较硬
D.自觉疼痛
