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45.The source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Suns very center. It is here that is to be found the source of the energy that the Sun constantly pours out i
Unit 6 Text A Listening First listening Before listening to the tape, have a quick look at the following words. insult 侮辱 bite 咬 prefer 宁愿 constructive 建设性的 rival 对手 professional
[00:01.85]Unit 8 Keeping Safe [00:06.33]Lesson 31 [00:12.63]Exercise 1.3 [00:16.83]The office of National Drug Control Policy [00:20.26]recently did a survey in the United States [00:23.23]about drugs and children and teenagers. [00:27.06]The ONDCP i
[00:04.10]Unit 23 Confilct Communication Workshop [00:09.27]Listening: [00:10.50]Exercise 2 Listen to Part 1 and [00:13.82]check your guesses for Exercise 1. [00:17.60]Then listen to Parts 1 and 2. [00:20.78]Answer these questions. [00:23.18]Part 1 [
Unit 140 Get a new slant on things Unit 140 用新的观点看事情 Some exercises are good for you because they're relaxing,and this is one of them.The only force operating here is gravity,the principle being to raise yoourur derriere and feet up o