闪蒸进样法

2000年1月大学英语四级考试试题及参考答案

Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there wi

发表于:2018-12-04 / 阅读(121) / 评论(0)

大学四级英语考试听力真题

Water Storage Systems

Broadcast: May 12, 2003 By Jill Moss This is the VOA Special English Development Report. Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels

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VOA2003（上）-社会广角

VOA慢速英语2010年-Agriculture Report - Growing Trees in

This is the VOA Special English Agriculture Report. Pieter Hoff used to export lilies and tulips from the Netherlands. He retired from the flower export business seven years ago. Now, he is trying to help people grow trees and plants in the desert --

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2010年VOA慢速英语(七)月

美国国家公共电台 NPR Desperate Cities Consider 'Safe Injection' Sites For Opioid Users

STEVE INSKEEP, HOST: Philadelphia is looking at a new tool to fight opioid addictions - supervised injection sites. That's where people can safely inject heroin or other opioids under medical supervision. It would be the first such site in the U.S.,

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2018年NPR美国国家公共电台1月

人生的结晶

Chemistry on an experiment called the crystal. First the formation of chemical substances dissolved in water solution, solution Sheng Yu evaporating dish, the evaporating dish placed in steel tripod, the following alcohol lamp heating, control-relate

发表于:2019-02-21 / 阅读(38) / 评论(0)

英语美文

英语听力文摘 English Digest 342、无辜的嘴唇

Why lips go dry？为什么嘴唇会干呢？ Lets start by reviewing the ways in which the surface of our lips is different from the surface of the skin on the rest of our bodies. Basically, our lips are made of the same mucus membrane that coats t

发表于:2019-02-24 / 阅读(65) / 评论(0)

英语听力文摘 English Digest

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学英语单词

3-phosphoglyceraldehyde dehydrogenase