小马听力第二季.doc

IBT-SAT 小马过河—专业备考社区 小马托福 TPO 听力精选二十篇系列（第二季） 第一季（1-5 篇）地址在这里下载： /dl/topic/ad13fb68d2d5434b86ddad6805def771 第二季目录 （六）生物学之植物——Nightcap Oak（夜冠橡树） （七）生物学之动物——Octopus （章鱼防御系统） （八）地球环境科学之气候——Milankovitch Hypothesis （米兰科维奇假说） （九）历史文学之人物作家——Emerson’s work（艾默生） （十）Business 之繁荣与泡沫——boom and bust（泡沫与繁荣）  本篇音频下载地址：  IBT-SAT 小马过河—专业备考社区  /dl/topic/be8bb6c6d8364735b587d 1c23cd098ff （六）生物学之植物——Nightcap Oak（夜冠橡树） Narrator: Listen to part of a lecture in a biology class. 12. What topic related to the Nightcap Oak does the professor mainly discuss? Click on two choices. ① factors that relate to the size of the area in which it grows ② the size of its population over the last few centuries ③ whether anything can be done to ensure its survival ④ why it did not change much over the last one hundred million years 13. According to the professor, what led scientists to characterize the Nightcap Oak as primitive? A. it has no evolutionary connection to other trees growing in Australia today B. it has an inefficient reproductive system C. its flower are located at the bases of the leaves D. it is similar to some ancient fossils 14. What point does the professor make about the Nightcap Oak’s habitat? A. it is stable despite its limited size B. unlike the habitats of many plants, it is expanding C. its recent changes have left the Nightcap Oak struggling to adapt D. its size is much larger than the area where the Nightcap Oak grows 15. According to the professor, what are two factors that prevent Nightcap Oak population from spreading? Click on two choices. ① The complex conditions required for the trees to produce fruit ② the fact that the seed cannot germinate while locked inside the shell ③ the limited time the seed retain the ability to germinate ④ competition with tree species that evolved more recently 16. Why does the professor mention the size of the Nightcap Oak population over the last few hundred years? A. to explain why it is likely the Nightc