字神帝國英語天地

上週托福命中字神真經7篇：閱讀3篇+聽力4篇，
今天來分享這篇最新的命中真經聽力是有關海洋生物學的，仍然是托福聽力常考話題之一。

文章是分類型結構，主要講解了魚類聚集行為（aggregation/group behavior）的三種假設：

1. meeting-point hypothesis

舉例：tuna就經常有這種行為，喜歡在漂浮在水面的大塊物體（比如浮木等）下聚集，魚群的數量越多，單個魚類被捕食的幾率就越小。

2. the shelter for predators hypothesis

舉例：很多魚類有自動變色（coloration）的功能，可以模仿背景色來躲避追擊。

3. food supply hypothesis

舉例：很多魚類經常跟著浪潮（ocean currents）一起游動，並且趁機食用海潮裡的微生物或者浮游生物。

人類會利用魚類的這種聚集行為來捕獵，發明了一種設備叫做FAD，這種設備大大促進了捕魚業的發展。

聽力原題：

1. What does the professor mainly discuss

2. What type of evidence does the professor refer to in support of the meeting-point hypothesis

3. What is the professor's opinion of the paper written by researchers in Spain

4. Why does the professor discuss fish coloration

5. Why does the professor discuss ocean currents

6. What points about tuna does the professor emphasize when she discusses artificial fish-aggregating devices, or FADs
Click on 2 answers.