【阅读】
标题：priority effect
定义：Animal species, when first settling on certain territory, makes the territory less habitable for later species. This is esp. prevailing for small and weak species.
听力要点
【听力】
例子: For example, there is a type of small ants that net on ankasha trees. As the first group of settlers onto the tree, they destroy part of tree’s nectars and render it unable to produce nectars anymore. This is because another type of bigger ants, which feed on this nectar and are more aggressive than smaller ants, will no longer come to this tree for occupation. Through this small ants survive.
第3题来源：大陆话题分类：Dilemma Choice属性：大范围重点预测
话题
Task 5 校园场景
解题思路
【听力】
问题：A party, students can relieve the stress from final exams and get away from books. A student band supposes to play music, however the leader of the band is sick, so the band was cancelled.
解决方案1：play records
优点1：/
缺点1：But recorded music is not as exciting as live music
解决方案2：Postpone the party to 1 week before the final exam.
优点2：/
缺点2：However some students will go home and miss the party.
第4题来源：大陆话题分类：Dilemma Choice属性：大范围重点预测
话题
Task 5 校园场景
解题思路
【听力】
问题：A boy needs to read a novel in order to write a paper. However, the library on campus is closed.
解决方案1：To go to another library.
优点1：/
缺点1：But it's too far away. It will cost a lot of time, and the student will miss some interesting courses.
解决方案2：To read another book.
优点2：/
缺点2：However, the student doesn't like the book.
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