患者女性，40岁，运动中突然出现剧烈头痛、喷射性呕吐，经检查诊断为蛛网膜下腔出血，最常见病因是( )

A．动脉硬化

B．脑底囊性动脉瘤破裂

C．动静脉畸形

D．血液病

E．脑血管炎

56. Manatees eat about 100    英磅   a day.      小题1:__________

57.    等   for her made me angry.              小题2: __________

58. Last Sunday, two kids    拜访  me.         小题3: __________

59. I’m more    外向的    than my sister.        小题4: __________

60. He didn’t know what was    发生   outside.   小题5: __________