用1%普鲁卡因进行局麻时，一次最大用量不应超过（）
A.50ml
B.70ml
C.80ml
D.90ml
E.100ml
参考答案：E
直角三角形中，两条直角边边长分别为12和5，则斜边中线的长是[ ]
A．26
B．13
C．30
D．6.5
Most Chinese children like to sleep with their mothers. They are __ the dark. [ ]
A. interested in
B. afraid
C. terrified of
D. sure of
