题目

Let’s look at some inventions that had their roots in the UK.The bagless vacuum cleaner（吸尘器), James Dyson,1979There are some things we don’t know we need until someone invents them. For example, the bagless vacuum cleaner. James Dyson came up with the idea after spending a lot of money on an expensive cleaner that simply pushed dirt around.Most of us would have given it up, but Dyson went on to change the basic principle of a vacuum cleaner --- an idea that hadn’t been challenged for 100 years --- by designing a system that removed the necessity of the bag for good. His final ver下列各物质的自述中，属于物质的化学性质的是 [     ]A.B.C.D.