根据对话内容在空白处填上合适的单词, 使对话完整正确.

A: What l       you going to be when you2       up?

B: I 3____    going to be a journalist.

A: 4____  are you going to 5      that?

B: I'm going to 6        aflicles and 7         them to magazines and newspapers.

A: 8____are you going to work?

B: I'm not 9       yet.  Maybe Xi'an10     Beijing.

急性心肌梗死发生心源性休克的主要机制是（）

A.心排血量急剧下降

B.快速性心律失常

C.血容量不足

D.周围血管扩张

E.迷走神经张力过高