2. 外语
  3. If you wipe a finger across a household surface that hasn’t been cleaned in the last few days, chances are you’ll【B1】______ with

If you wipe a finger across a household surface that hasn’t been cleaned in the last few days, chances are you’ll【B1】______ with

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问题     If you wipe a finger across a household surface that hasn’t been cleaned in the last few days, chances are you’ll【B1】______ with dust. Look around and you’ll find the stuff everywhere, from the particles【B2】______ in the sunlight to the fine【B3】______ of dirt coating TV screens, bookshelves, and car dashboards. Dust comes from everything and, like death and taxes, you can’t avoid it. When things—shoes, rocks, plants, socks, anything at all—begin to【B4】______, they release tiny pieces of themselves into the air. These【B5】______ bits settle everywhere, and because matter is always coming apart, dust production is a never-ending business.
    In a typical household, dust【B6】_____ mainly of things such as dead insect parts, sheets of skin, food particles, and pieces of fabric. But not all dust is the product of natural【B7】______; we create amazing quantities of dust everyday. For example, a single puff(吸)of a cigarette contains an estimated four billion large dust particles. Industry of all sorts, from the【B8】______ of a piece of wood to large-scale steel manufacturing, creates particular kinds of dust. In short, dust is all around, ever, in the air we breathe. Because its particles are so small, dust is highly【B9】______. Westward winds regularly blow dust from the Sahara desert across the Atlantic and into the【B10】______ above American coastal towns, where it contributes to some thrilling sunsets.
【B7】
选项
答案decay
解析 根据空前的介词of和形容词natural可知，此处需填入名词。decay“衰败(或衰退)状态”。注意勿写成decade。
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