题目内容

to improve this skill build on what you say by adding more ____ in your answers -- but make sure these are relevant to the question

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In part 3 particularly you can develop answers by including reasons, comparisons or personal____

The key to improving fluency is to ____ using English in everyday communication as much as possible.

已知A为3阶实对称矩阵，则A的特征值可能是（）.

A. 1,2，i
B. 1，2i，-1
C. 2,3，1-i
D. 1,1，1

A检属于（）。

A. 深度功能检查
B. 中间检查
C. 大修
D. 基本检查