请问机考怎么计分的

250分是不是只能错15个左右？

比如听力部分30题，是不是错一个扣一分？

以下是摘录自KAPLAN的 TOEFL CBT 的有关内容：

Computer Adaptive Test Scoring

When you start a section, the computer:

      * Assumes that you have a medium level score as defined by ETS's TOEFL division

      * Gives you a question of medium difficulty

What happens next depends on whether you answered the question correctly. If you answer the question correctly:

      * Your score goes up

      * You are given a slightly harder question

If you answer a question incorrectly:

      * Your score goes down

      * You are given a slightly easier question

This pattern continues for the rest of the test. Every time you answer a question correctly, the computer raises your score, then gives you a slightly harder question. Conversely, every time you get a question wrong, the computer lowers your score, then gives you a slightly easier question.

另外，作文成绩会影响托福最后的总分。

如果要笼统的用数字来讲，要拿250分（作文5分以上），错题要控制在大约12个以下。希望有点帮助~ 祝你取得理想成绩！

强！！！

支持！！