◆化　学

Passage 6

The pluses of polycarbonate plastics are easy to see. A child’s cup now bounces rather than shatters when it’s tossed out of the high chair. People with terrible eyesight can wear featherweight glasses rather than massive, heavy glass lenses. People like polycarbonates for their lightweight clarity and their toughness under fire. Nevertheless, polycarbonates appear to have some minuses, too. Until recently, when a few manufacturers changed their processing, all polycarbonates were found to leach a chemical called bisphenol A (BPA). This chemical, once studied as a potential estrogen replacement, is believed to inhibit the endocrine system and to be especially harmful to young children. It is possible now to buy BPA-free products, but the consumer should assume that BPA is in a polycarbonate product unless it is labeled otherwise.

Consider each of the choices separately and select all that apply.

Which of the following generalizations is supported by the passage?

A. All polycarbonates are durable and light.

B. All polycarbonates leach bisphenol A.

C. All children should avoid bisphenol A.

「文章大意」

本文主要围绕聚碳酸酯塑料制品（polycarbonate plastics）的优点及危害展开，首先介绍了碳酸酯塑料制品在人们日常生活中所带来的便利，接着指出在加工的过程中，聚碳酸酯会产生一种化学物质，而这种化学物质会对内分泌系统造成影响，尤其会对孩子产生危害。

答案详解

A, C  根据“People like polycarbonates for their lightweight clarity and their toughness under fire.” 可知A正确；根据“This chemical, once studied as a potential estrogen replacement, is believed to inhibit the endocrine system and to be especially harmful to young children.” 可知C正确，故本题选A、C项。