偏头痛（）
A.月经期发作频繁
B.头痛伴剧烈呕吐
C.头痛伴视力障碍
D.头痛伴癫痫发作
E.头痛伴神经功能紊乱者
参考答案：A
I wanted to buy a comic book for my cousin, but there was _________ left in the shop.
A．none
B．anything
C．nothing
D．something
绝缘夹钳使用时不允许装设接地线。第七章
