【正文】 might read up on Piaget39。d be thinking mostly about herself and her own needs, and might not be able to see things from anyone else39。s that? Student Where can I find a child to observe? Professor Um, I suggest you contact the education department secretary. She has a list of contacts at various schools and with certain families who are somehow connected to the university. Sometimes they are willing to help out students with projects like yours. Student Ok, I39。ve e up with some ways to attract more people to shop downtown was by creating pedestrian malls. Now, what is a pedestrian mall? It39。s offlimits to automobile traffic would be ideal for a heavily populated city, where, well, the streets would otherwise be bustling with noisy, unpleasant traffic congestion. Now the concept which originated in Europe was adopted by American city planners in the late 1950s. And since then, a number of Unites States cities have created pedestrian malls. And many of them have been highly successful. So what have city planners learned about making these malls succeed? Well, there are two critical factors to consider when creating a pedestrian mall location and design, both of which are equally important. Now let39。t drive into the mall area, well then they need to have easy access to it. OK, so that39。t a convention center around to help draw in visitors and well the only nearby hotel eventually closed down for that same reason. Well, you can imagine how this must have affected local and pedestrian mall business owners, sort of what we call a chain reaction. It wasn39。cuz if you go back before Europeans settled in North America, like before the 1600s, back when native Americans were the only people living here, well, back then there were a lot of beavers. But later on, after Europeans... Professor Oh, OK, wait. I see where you are heading with this. But before we go into how European settlement affected the ecosystem, tell me this: what kind of environment do beavers live in? Think about what it was like before the European settlers came. We’ll e back to where you were headed. Kate OK, well beavers live near streams and rivers, and they block up the streams and rivers with like logs and sticks and mud. You know, they build dams that really slow down the flow of the stream, so then the water backs up and creates like a pond that floods the nearby land. Professor And that creates wetlands. OK, tell me more. Kate Well with wetlands, it39。t grow near running water. Oh and there39。cuz there is no dam, so the ecosystem would be pletely different. There would be fewer wetlands. Professor Exactly. So now let39。s what a keystone species does in an ecosystem. It39。m not sure, but urn... is this the Carter language lab? Manager Yes, it is. How can I help you? Student I39。t. Manager OK, well, you have to watch the videos here. You need to sign in to reserve an open room and sign out the video you need. Just start with the first one in the series. Each video39。t want to miss anything, you know, and he39。s called, the other one, well it was all about fighting and battles. I mean can both of them be considered poems? Professor Well, think back to the very beginning of this course. Female student Aha? Professor Remember how we, we define poetry? In the very broadest sense, we said it39。t know a lot about the authors. It39。s a...he has a...he39。s pare that to the hero in the other poem. The other poem is an example of what39。s worthy of respect and love from his lady. He39。t central to people’s lives. More peaceful times meant there was more time for education, travel, more time for reflection. Another name for Romance poetry that39。s especially interesting about meteorite is that they e from interplaary space, but they consist of the same chemical elements that are in matter originating on earth, just in different proportions. But that makes it easier to identify something as a meteorite as opposed to...to just a terrestrial rock. So to talk about where meteorites e from, we need to talk about ets and asteroids, which basically...they are basically made up of debris left over from the origin of the solar system billion years ago. Now I39。ll just cover some basic info about them. OK, ets and asteroids. It might help if you think of…r emember we talked about the two classes of plas in our solar system, and how they differ in position, the terrestrial plas like Mars and Earth, posed largely of rocks and metals, and the large gas giants like Jupiter? Well, the solar system also has two analogous classes of objects smaller than plas, namely asteroids and ets. Relatively near the sun, in the inner solar system, between Jupiter and Mars, to be precise, we39。s atmosphere, well, that makes them so special that they get a special name they are called meteors. Most of them are very small, and they burn up soon after entering Earth39。s rare to ever find one. I mean it39。ll be...they are iron meteorites, or the stony iron kind, even though they only make up about 5% of the meteorite material on the ground. TPO14 Listening Section 1 Conversation 1 已整理 Narrator Listen to a conversation between a student and a library employee. Student Hi! I39。s still here in the library, so people must be using it. You know this seems to be a very popular book tonight. We show six copies。s not in the class wants to use the book? Employee That39。t think they39。s not a requirement. The job might still be open. At the beginning of the semester we were swamped with applications, but I guess everyone who wants a job has one by now. Student What can you tell me about the job? Employee Well, we work between six and ten hours a week, so it39。ve heard of studies in which people hear a list of related words. Um…l