利润中心对成本的控制是联系着收入进行的，它强调绝对成本的节约。（）

---What do you think of your new English teacher？

--- She was well prepared for her first lesson and left us a good________.

A．expression

B．instruction

C．appearance

D．impression

紫癜伴发热（）

A.败血症

B.肝脏病

C.血液系统疾病

D.弥散性血管内凝血（DIC.

E.过敏性紫癜

_______was said that_______ was how the Chinese first raised silk worms.

A．It;that

B．People;it

C．They;that

D．Somebody;it

It is immediately clear ____ the financial crisis will soon be over. [ ]

A. since

B. what

C. when

D. whether

抗癫痫药对胎儿有害，传统AEDs在FDA妊娠安全分级为（）

A.A级

B.B级

C.C级

D.D级

E.X级