I have pen.[ ]
A. two
B. one
C. three
答案：B
I hate traveling by air ______ you usually have to wait for hours before the plane takes off.
A．because
B．though
C．until
D．unless
有关烧伤创面脓毒症的概念以下哪一项是错误的()
A．创面有细菌感染，并向痂下邻近的非烧伤组织侵入
B．痂下组织细菌量计数超过10CUF/g
C．创面可以没有细菌感染，但痂下组织细菌量计数超过10CUF/g
D．血培养多为阴性
E．细菌毒素引起全身感染中毒症状
