急性脑血管疾病的诱发因素有（）
A.高龄
B.不良饮食习惯
C.酗酒、吸烟
D.高脂血症
E.精神紧张
参考答案：A, B, C, D, E
In his_____，Wilson returned to his hometown and began to teach .
A．thirty B．thirties C．thirtieth
He is a new comer, _______ he has few friends here. [ ]
A. but
B. so
C. however
D. because
