Extraterrestrial lmpact and Megafauna Extinctions     About 13,000 years ago, near the end of a period called the Pleistocene, North America was populated by megafauna (...

Part 2 You should spend about 20 minutes on Questions 14-26, which are based on Reading Passage 2 below. Can the planet's coral reefs be saved? A 14 Conservationists have put the ...

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综合写作： Orcas are large predatory whales whose typical coloration is mostly black with some white patches. In recent years, however, sightings of an unusual, almost completely ...

  Agricultural Practices of the Maya   题目：     The Maya civilization flourished for centuries on the Yucatan Peninsula and other areas of Mesoamerica, reac...

Part 3 You should spend about 20 minutes on Questions 27-40, which are based on Reading Passage 3 below. Robots and us Three leaders in their fields answer questions about our rela...

The Search for the Origins of Writing     Who invented the first writing? Like many questions of its type in archaeology, this one is not easily answered. Some might arg...