小黑老师独家英语学习资料-大话短文53

第53期 Farmed Fish Are Safer

科学饮食实为头等重要之事。关于农药、生长激素，以及转基因食品的是是非非，将芸芸众生搞得晕头转向，无所适从。但是最近的研究发现，南部地区的水产养殖场人工养殖的鱼类所含各种污染物质的指标要远低于江河湖海中捕获的鱼类。

So why are farm-raised fish usually safer? Purdue researcher Charles Santerre cities several reasons: They don’t graze polluted river bottoms and lakebeds. Also, they are fed commercial fish food that must be guaranteed safe by the manufacturer-versus munching down other fish, which may them selves contain pollutants. And finally, they are usually raised in ponds filled from ground water that tends to be much cleaner than surface waters. 健康的生活是我们人人都追求的，既然人工养殖的鱼类受污染小，我们何不选择人工养殖的鱼类呢？

重点“解毒”如下，词汇及句子： commercial adj. 词汇 munch v. pollutant n.

commercial指营利的，以营利为目的的，eg: Oil is present in commercial quantities, ie there is enough to make extraction profitable.石油的储量有商业开采价值。Munch指用力咀嚼（某物）。Munch (at/on) an apple用力嚼苹果。Pollutant指污染物质（如机动车辆排出的废气）：releasing pollutants into the atmosphere.指将污染物质排放到空气里。

句子：①They don’t graze pdluted river bottoms and lakebeds. Also, they are fed commercial fish food(that must be guaranteed safe by the manufacturer-versus munching down other fish), [which may themselves contain pollutants].

( )部分为that引导的限制性定语从句。 [ ]部分为which引导的非限制性定语从句

②They are usually raised in ponds filled from ground water (that tends to be much cleaner than surface waters).

( )部分为that引导的限制性定语从句。