爆炸可分哪几种？

Ann is a good student. She _____gets up early and is______ later for school.

A. never, never     B. always, always      C. always, never

史书记载的“公作则迟”“分地则速”现象发生在 [ ]

A．商朝

B．西周

C．春秋战国

D．夏朝

E-mail as well as telephones, _____ an important part in daily communication.

[      ]

A. is playing

B. have played

C. are playing

D. play

石油沥青的针入度值越大，沥青材料的黏滞性______。

A．越好
B．越差
C．不变
D．无关

女，48岁，因头痛，左眼上睑下垂拟诊左侧颈内动脉～后交通动脉动脉瘤，入院后经脑血管造影证实诊断。住院期间用力大便后突然头痛加重，首先应考虑为

A．脑血管痉挛

B．颅压增高

C．蛛网膜下腔出血

D．动脉瘤增大

E．血管性头痛