内毒素如何引起发烧？
参考答案：
内毒素注射到温血动物或人体后，刺激宿主细胞释放内源性的热源质。热源质对大脑控温中心的作用会引起动物发烧。
__________, the pay isn’t attractive enough, though the job itself is quite interesting.
A．Generally speaking
B．On the contrary
C．In particular
D．To be honest
In April, 2009, President Hu inspected the warships in Qingdao, ________ the 60th anniversary of the
founding of the PLA Navy.[ ]
A．marking
B．marked
C．having marked
D．being marked
