古氏

实用英语综合教程第三册-5

UNIT 5 Text A PRE-READING TASK Exercise 1 Before reading the passage, think over the question. Should a scientist be responsible for the results of his or her work? Why or why not? Now read the passag

发表于:2018-12-04 / 阅读(128) / 评论(0)

实用英语综合教程

VOA常速英语2017--HIV或越“变”越弱

HIV, the virus that causes AIDS, frequently mutates. That has allowed the virus to bypass the immune system and infect about 80 million people over the last 35 years. However, researchers say the rapid evolution of HIV actually may be reducing its ab

发表于:2018-12-08 / 阅读(107) / 评论(0)

VOA标准英语2017年(二月)

SSS 2009-03-20

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Some people are worried that the more we learn about genetics, the closer well get to a day when we can choose all sorts of characteristics for our bab

发表于:2018-12-24 / 阅读(51) / 评论(0)

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step by step 第四册 lesson 128

Lesson 128 Part Ⅰ Warming-up Exercises Instruction-following: How to Make a Proper English Tea Tea: 1. boil __________________ 2. __________________ (boiling water) 3. __________________ (1 teaspoon

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英语听力入门 (全四册)

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I have never encountered such s in a book by a professional, Fortey wrote later. 一位专业人员在书里竟然如此怒气冲冲，我可从来没有碰到过，福泰后来写道， The casual reader of The Crucible of Creation, unaware of the h

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万物简史

万物简史第467期:生命在前进(9)

The Burgess Shale included a range of disparity in anatomical designs never again equaled, 布尔吉斯页岩化石所包含的横剖面的花色范围是独一无一的， and not matched today by all the creatures in the world's oceans, Gould wrote

发表于:2019-02-17 / 阅读(51) / 评论(0)

万物简史

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bleeding heart dicentra spectabilis dc.