Usually, scientists don't know exactly how disasters (such as a tanker accidentally spilling its whole cargo of oil and polluting huge areas of the ocean) will affect the environment until after they've happened. (剑14-T4-R3)
Definitions range from discrete descriptions of various types of play (such as physical, construction, language, or symbolic play) (Miller & Almon 2009),to lists of broad criteria, (based on observations and attitudes), that are meant to capture the essence of all play behaviors (e.g. Rubin et al. 1983 ). (剑14-T3-R3)
Implicit theories of intelligence and of the relationship of intelligence to society perhaps need to be considered more carefully than they have been because they often serve as underlying presuppositions for explicit theories and even experimental designs that are then taken as scientific contributions. (剑14-T3-R1)
3. Test1-Reading3 里面有很多实用的英语表达可以用在雅思大作文job satisfaction的写作里面。比如：
4.Test4-Reading2,第一段就是值得大家背诵的了，这篇对于雅思大作文(animals kept in the zoo)非常有帮助!