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Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped bacteria are u

发表于:2018-11-28 / 阅读(424) / 评论(0) 分类 新概念优美背诵短文50篇

Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is abo

发表于:2018-12-01 / 阅读(141) / 评论(0) 分类 新东方背诵文选

AMERICAN MOSAIC - November 29, 2002: Native American Music and Movies / Question About Thanksgiving HOST: Welcome to AMERICAN MOSAIC --VOA’s radio magazine in Special English. (THEME) This is Doug J

发表于:2019-01-02 / 阅读(72) / 评论(0) 分类 American Mosaic

By Ruth Reader Washington, DC 13 February 2008 There is growing concern around the world over illnesses caused by new antibiotic-resistant bacteria, or so-called superbugs, and the decreasing effectiveness of antibiotics to treat infections. Earlier

发表于:2019-01-07 / 阅读(67) / 评论(0) 分类 VOA常速英语2008年(二月)

Experts: Let Produce Dry Out to Avoid Bacteria American researchers say farmers should wait one day after a rain storm or watering their fields to harvest fresh fruits and vegetables. They say gathering the crops at least 24 hours after rainfall incr

发表于:2019-01-12 / 阅读(112) / 评论(0) 分类 2015年VOA慢速英语(七)月

AMERICAN MOSAIC -March 15, 2002: Music written by John Williams / A question about Saint Patrick's Day / Watching baseball players get ready for the season Broadcast: HOST: Welcome to AMERICAN MOSAIC —

发表于:2019-01-30 / 阅读(192) / 评论(0) 分类 American Mosaic