联合国的总部设在（ ）
A．英国的伦敦
B．美国的纽约
C．瑞士的日内瓦
D．法国的巴黎
答案：B
He ________ a piece of waste paper, and put it into the rubbish bag. [ ]
A. picked up
B. threw away
C. looked for
D. handed in
什么是自动喷水灭火系统的末端试水装置？
