A:盐酸、水煤气、醋酸、干冰
B:液氯、氯水、硫酸钠、乙醇
C:空气、天然气、苛性钾、硫酸钡
D:胆矾、漂白粉、氯化钾、氯气
Peter ____(fly) his kite in the park last Saturday.