Nopain, no gain.我們的安排是這樣的，第一遍用聽力軟件精聽材料（建議做單句聽寫，聽寫的時候不要偷看我給的挖空題），然后按照我給的挖空題填關鍵詞，回復后即可看到聽力原文和文章精解，我將把難點和易錯點oneby one 分析給大家。
I'd like to begin by thanking Dr. Kane for inviting me to be here today. Although I'm not a geologist, I have been collecting minerals for years. My collection is really ______ because I've traveled all over the world to find them. Today I've brought a few specimens for you to see. After I discuss each one, I'll pass it around so that you can look at it more closely. As you know, ______ are the most ______ minerals and are divided into a number of types. These first samples are ______. Notice that they vary in color from white to pink to red. This glassy one is found in volcanic rock. In fact, I found it in New Mexico on a collecting trip. This next sample that I'll pass around is a ______ mineral, also called amazon stone. You can identify it by its bright green color. It's often used in jewelry and really is quite attractive. These final samples are all ______ feldspars. Many plagioclases are very rare, so I'm particularly proud of the variety in my collection. I've also brought a few ______ of some larger mineral samples, and if you'll turn out the light now, I'd like to show them to you.