Quot from MIT PhD admission requirements 顯然GPA很重要、
Your GPA in undergrad is the single most important factor in PhD admissions. If your GPA is too low your application will be dismissed out of hand. While there are no hard limits, we suggest a minimum GPA of 3.5 for serious contention, especially at top schools. If your GPA is below 3.0 then you will likely not get admitted into any PhD programs.