自发性蛛网膜下腔出血的常见病因有（）
A.颅内动脉瘤
B.脑血管畸形
C.脑结核瘤
D.高血压
E.脑膜膨出
参考答案：A, B, D
--- Where is Mr. Smith? --- He ________ Guangzhou. He ________ there for a week.
A．has gone to; has been to
B．has gone to; has been
C．has been to; has gone to
D．has been in; has gone to
全球跨国投资的主要方式是( )。
A．投资
B．融资
C．并购
D．贷款
