Nopain, no gain.我们的安排是这样的，第一遍用听力软件精听材料（建议做单句听写，听写的时候不要偷看我给的挖空题），然后按照我给的挖空题填关键词，回复后即可看到听力原文和文章精解，我将把难点和易错点oneby one 分析给大家。
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.