2016-2017学年人教版必修三 Unit 4 Astronomy ：the science of the stars language points课件 (6)-302edu教育资源网

2016-2017学年人教版必修三 Unit 4 Astronomy ：the science of the stars language points课件 (6)

1. However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions. to begin with和 to start with：两个词组都有“以……开始”的意思.

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