Get up early, ______ we can get to school early the next morning. [ ]

A. or

B. then

C. so

D. and

创伤性炎症的有关介质中，引起血管收缩和血小板聚集的是

A．前列腺素E2(PCE2)

B．前列环素(PG

C．血栓素A2(AXA2)

D．前列腺素A(PG

E．组胺