OG (Official Guide to the TOEFL Test) 是TOEFL考试的研发机构ETS编撰的实战备考指南，同时具有官方权威性和基础必备性。指南中包含三份完整的模拟试题以及上百种实用技巧，为考生提供综合性的一体化TOEFL考试参考，是提升考试技巧，帮助发挥最佳水平的有效工具。
1. 阅读要点概括
Theme:
Altruism means one will sacrifice its interest for others even without return
Key point 1:
Humans’ sharing of food and donation of body organs can be regarded as altruism
Key point 2:
By sentinel guarding, meerkats will benefit others without gaining food
Key point 3:
After giving alarms, the guarding one cannot ensure its own survival
2. 听力要点概括
Theme:
Re-examine, a recent study
Key words 1:
Before, stand guard, first, predator, most likely, escape, greater danger
Key words 2:
Alarm, draw, attention away from, increasing, chances of survival
Key words 3:
Donates a kidney, stranger, appreciation, approval, society, self-worth, valuable.
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(编辑：Sally)
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