02Unit 1 Science and Scientists B卷 能力提升卷-【金卷1号】新教材2023春高中英语选择性必修第二册 单元检测AB卷（人教版2019）

Unit l SCIENCE AND SCIENTISTS B卷 能力提升卷 (时间:120分钟 满分:150分) 第一部分 听力(30分)略 第二部分 阅读(共两节,满分50分) 第一节(共15小题;每小题2.5分,满分37.5分) 阅读下列短文,从每题所给的A,B,C,D四个选项中选出最佳选项. Bitcoin has been all over the news lately. Apparently, theidea of money that's not tied to a specificbank— or a specificcountry—is appealing to many. But it's worth remembering that the banking system that we now all live with isjust that: a modern invention. In the past, money's makeup varied from place to place, depending on what was considered valuable there. Today, on an island in the Pacific, a specifictype of shell still serves as currency— and some people there are 跳_mordmgi.Omiced tatmeay,iwilmke themvealy lemd mgiuio On Malaita, the largest island that's part of the Solomon Islands, shells are accepted at most places in exchange for goods. "How much tuna (金枪鱼肉)youcanget for your shells depends on their color and shape," Mary Bruno, a shop owner from the city of Aukion Malaita, said."One string of darker shells might get you about two cans Ⅰ区 _of tuna,but the red ones are worth more. For the red ones, one string might get enough tuna to feed a big family for a long time." There's only one place on the island where the shells. Which are polished and strung together to form 3-foot-long │紧 ropes,are made. The strings of red, white, and black shels all come from the Langa Langa Lagoon, Once trapped out on the islands, the locals needed a curreny to use among themselves, and so the shell currency was born. Using shells for money was common throughout the Pacificislands as late as the early 1900 s, but Malaita is s unique in that they all still were used today. Andjust like Bitcoin, there are those who think the islanders are smart to invest (投资)inthistypeof money, which is reported to have risen in value over the last three decades. It might seem strange to keep a bunch of processed, srungtogether shells, but what is a pile of 的,dollars? 21.Which of the following can replace "hoarding"u