关于卫生服务的需求和利用研究属于()
A.调查研究
B.实验研究
C.文献研究
D.健康危险因素评价
E.卫生服务研究
参考答案：E
— Shall we go shopping now?
— Look at the clouds, I’m afraid there be heavy rain. I guess we stay at home. [ ]
A. will; are to
B. is going to; ’d better
C. will; are going to
D. is going to; would
（）的蛇毒中既含神经毒，又含血循毒。
A.黑眉锦蛇
B.蝰蛇
C.金环蛇
D.眼镜蛇
