托福写作
综合写作：
1. Osteriod 纪元物种大灭绝有三种假说： 1 由气候变冷冰川形成导致的海平面降低， 2 由陨石撞击导致尘埃遮蔽太阳光; 3 由于太阳辐射加剧
教授认为三种假说都有weakness 1 ice sheet formation is slow and gradual but extinction happens at early age of process when sea level has not yet dropped; 2 no evidence support; 3 based on the assumption that t**** lives on the surface of ocean, which is not proved
独立写作：
if you have chance to change one of below to improve health, which would you choose. 1. food eaten, 2. amount of excercises, 3. amount of stress in life
