单词：hydroxide ions
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[00:00.00]MODULE 2 Unit 4 [00:04.78]1.listen and write the lettters in the circle. [00:47.86]2.Listen and match the insttructions with the picttures. [00:55.72]Put the correct leetters in the blanks. [01:35.87]3.Listen and draw a face foollowing the
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Transcript This is Scientific American's 60-Second Science, I am Cynthia Graber.This will just take a minute. Physicists at the Brookhaven National Laboratory have been able to send information ahead of particle beams racing at nearly the speed of li
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True Confessions Day is on March 15th. Were not really sure where it came from or how long it has been around. It seems a fun way to make your confessions and lose any guilty feelings you might have. How many bad things have you done in the past year
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This is Scientific American's 60-Second Science. I'm Cynthia Graber . This will just take a minute. Theres a traditional bowl in Korea that locals say makes food safer. And they might be right. The bowl is made of almost 80 percent copper. Copper ion
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Now, the VOA Special English program WORDS AND THEIR STORIES. 现在是美国之音慢速英语词汇典故节目。 Monkeys are very similar to us in many ways. Most have ten fingers and ten toes, and brains much like ours. We enjoy watching them be
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In these five spots, expats will likely be greeted with a warm welcome, a helping hand and a friendly smile. 居住在下面这五个国家的外国人会受到本地人的热烈欢迎、及时的帮助和亲切的微笑。 For many expats, finding n
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