A summary is the general idea of the original material in brief form. The features of a summary include:

A.It is an efficient and concise way of presenting ideas and information from other sources .

B.It allows you to include a large amount of information in a small number of words .

C.It is shorter than the original text .

D.You can summarize many types and lengths of text.

正确答案：It is an efficient and concise way of presenting ideas and information from other sources .；It allows you to include a large amount of information in a small number of words .；It is shorter than the original text .；You can summarize many types and lengths of text.