绝对值小于3.1的整数有多少个． [ ]
A．5
B．6
C．7
D．8
答案：C
惊厥前伴剧烈头痛，可见于（）
A.癫痫大发作
B.蛛网膜下腔出血
C.重度失水
D.脑出血
E.脑梗死
They are determined to work out the task,____difficult it is.
A．however
B．no matter what
C．no matter what
D．whatever
