热原组织中致热活性最强的是
A．脂多糖
B．蛋白质
C．磷脂
D．多肽
E．葡萄糖与蛋白质结合物
参考答案：A
If you travel by _______ train, you can have quite a comfortable journey, but make sure you get ______ fast one.
A．the ; the
B．不填 ;a
C．the ;a
D．不填;不填
