单词：salivary gland calculi
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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
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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
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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
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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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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
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