【正文】 how solar electricity is generated (產生 ). Before you can build your own solar panels, you first need to understand how solar cells generate electricity. Once you?ve bought individual solar cells (they can be purchased online), the basic process for building your own solar panel goes like this: Prepare the backing (底板 ) for your panel. Many DIY solar panel builders prefer to use a wooden board as the base for their solar cell. You?ll need to drill holes in the board so that the wires for each cell can pass through. Wire your solar cells together. This requires some experience with electrical work. Use a soldering iron (烙鐵 ) to attach wire to the solar cells and then link each of the cells together. Attach cells to your backing. If possible, attach each solar cell to the backing individually. This makes it easier to replace a single cell in the event that bees damaged or is not operating properly. At this point you have a functional solar panel that can produce electricity when the sun shines. However, a solar panel by itself is not useful. If you are trying to generate electricity to power devices in your home, you need to pair your panel with an inverter (換流器 ) that will turn direct current (DC) power from the sun into the alternating current (AC) power used in most modem electronic devices. 28. What does the author think of building DIY solar panel in the first paragraph? A. It is easy. B. It is necessary. C. It is mon. D. It is worthwhile. 29. What?s the first step of building your own solar panels? A. Master the advanced knowledge of management. B. Buy individual solar cells. C. Prepare the backing for your panel. D. Drill holes in the wooden board. 30. Why are solar cells connected to the wooden board separately? A. To produce more power. B. To substitute damaged cells easily. C. To attach cells to the backing tightly. D. To pass through the wooden board easily. 31. What can be inferred from the text? A. People with electrical skills have advantages over those without in DIY solar panels. B. A functional solar panel can give power to your home devices directly. C. How to pair an inverter depends on how much you want to power. D. A wooden board is a must for your own solar panels. D If you are like most English learners, you may be familiar with this: You think you understand a topic. Yet when asked to use what you have learned, you are not able to remember the information. Not being able to retrieve (數(shù)據檢索 ) new ideas could happen on a test or even in a conversation. Sarah Lynn, an educational consultant and teacher, thinks English learners can improve their ability to remember and use new words by testing themselves. She adds that selftesting improves retrieval — the ability to use and remember new words. Lynn is not the only expert who remends selftesting. A paper in Journal of Applied Research in Memory and Cognition says one benefit of testing practice is that it improves retrieval. Retrieving information once makes retrieving that information easier in the future. In addition, the paper says, when students test themselves as part of studying, they learn what they do not know. When students know what they do not understand, they can pay attention to overing their weaknesses. Lynn remends that learners test themselves by getting away from what they are studying. Then, they should test themselves by thinking about what they have learned. She remends that learners make themselves write or speak something. Lynn suggests reading something or watching a video on the topic, then getting rid of the reading or video material and summarizing it. This will allow learners to test what they know. Next time you are studying English, try to test yourself. But do not just assume that you can read something once or twice and fully understand it. Even if you highlight important points or take notes in a class, you probably do not fully understand what you learned. After all, Olympic athletes cannot learn how to swim or run just from reading a book. They have to practice swimming or running every day for years. They often pete in races to test their skills. 32. What?s the mon situation faced by English learners? A. They fail to e up with new ideas. B. They are not familiar with a certain topic. C. They don?t learn as well as they think. D. They don?t know how to improve their testtaking skills. 33. Which is the advice given by Lynn about selftesting? A. Recall what?s learned with the book closed. B. Remember what?s learned by repetitive reciting. C. Question your teachers on what you doubt bravely. D . Challenge yourself to learn from videos. 34. Why are Olympic athletes mentioned? A. To show how to be successful athletes. B. To make people confident of learning. C. To warn English learners not to be proud. D. To stress the significance of practice. 35. What?s the best title of the passage? A. Learning actually takes effort most. B. Improve English by selftesting. C. Memorize more new words.