What is the lecture mainly about?A. Reasons CoT starfish are attracted to coral reefs.B. Possible causes of change in the CoT starfish population.C. Evidence that coral decline may not be related to the CoT starfish.D. Proven ways to effective control the CoT starfish population.
第1个回答 2015-06-02
教授在最开始的时候说：“我们已经讨论过导致热带珊瑚礁减少和死亡的自然和人为因素。”随后又说：“So now let’s focus on a specific example of a natural predator that can cause a lot of damage to coral reefs — the Crown of Thorns, or CoT starfish.”也就是说现在要开始讨论一个具体的自然因素：天敌 CoT 海星。随后大部分篇幅都在讲导致这种海星数量变化的因素。也就是 B 选项表达的意思。
