Theword“they”underlinedinParagraph4refersto______. A: years B: climates C: sediments D: cores

Dual-core processor has ____________. A: One CPU core B: Two CPU cores C: One-level cache D: Two-lever cache

Years ago, many downtown cores in small to mid-sized cities_____. A: had hardly any business activity B: were crowded in business hours C: exhibited no signs of prosperity D: looked deserted in the evenings

Now that we know how old each coral was at the time of its coring we can learn more about how fast they were growing relative to each other. Coral cores A and B are shown to scale. Given this, which coral has been calcifying faster? A: Coral A B: Coral B

Years ago, many downtown cores in small to mid-sized cities [u]       [/u] 未知类型：{'label': 'questionDesc', 'content': '根据题干问题判断答案出于材料的哪个部分？', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2017年12月 六级 卷一 仔细阅读2', 'isMemberControl': 0, 'type': 181} A: ① B: ② C: ③ D: ⑤

Years ago, many downtown cores in small to mid-sized cities[u]      [/u]. 未知类型：{'label': 'questionDesc', 'content': '请根据材料选择正确答案。', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2017年12月\xa0六级\xa0卷一\xa0仔细阅读2', 'isMemberControl': 0, 'type': 181} A: had hardly any business activity B: were crowded in business hours C: exhibited no signs of prosperity D: looked deserted in the evenings

Years ago, many downtown cores in small to mid-sized cities [u]      [/u]. 未知类型：{'label': 'questionDesc', 'content': '请根据材料选择正确答案。', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2017年12月 六级 卷一 仔细阅读1', 'isMemberControl': 0, 'type': 181} A: A sudden emergence of the knowledge industry. B: Flooding in of large crowds of migrant workers. C: Modernized housing and improved infrastructure. D: More comfortable life and greater upward mobility.