1 . 将下列几个部分(A、B、C、D和E)按题号排序，构成一个符合逻辑的完整语篇。
A. Based on people’s grammar scores and information about their learning of English, the researchers developed models that predicted how long it takes to become fluent in a language and the best age to start learning.
B. To find the answer, the research team turned to the Internet, to collect data on a person’s current age, language ability and time studying English.
C. The older you get the more difficult it is to learn to speak English like a British. But no one knows exactly at what age it becomes harder, to learn a new language.
D. They concluded that the ability to learn a new language is strongest until the age of 18. This is not to say that we cannot learn a new language if we are over 18, but most of us will not be able to master grammar like a native speaker.
E. They also created a short online grammar quiz that tested noun-verb agreement, pronouns, prepositions, and relative clauses, etc.