下列物质属于纯净物的是
A．液氯
B．漂白粉
C．盐酸
D．碘酒
答案：A
由同种物质构成的是纯净物，由不同种物质构成的是混合物。BCD都是混合物，答案选A。
With so many problems____ , the newly-elected president had a hard time.
A．settled
B．to settle
C．being settled
D．was settled
装车时，对易碎、鲜活、放射性物品有哪些要求？
