单词：self-verifying
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Small kits are now available similar to pregnancy tests that can determine whether a person is infected with HIV, the AIDS virus. But the tests can give a false positive reading if used incorrectly, possibly dealing an emotional or psychological blow
发表于:2019-02-06 / 阅读(228) / 评论(0)
VOA标准英语2010年(七)月
VOA标准英语2010年(七)月
The Importance of Scientific Experiments The rise of modern science may perhaps be considered to date as far back as the time of Roger Bacon(1), the wonderful monk and philosopher of Oxford(2), who lived between the years 1214 and 1292. He was probab
发表于:2019-02-25 / 阅读(199) / 评论(0)
双语有声阅读
双语有声阅读