附词汇总表和部分练习参考答案。

Each volume also has the new words, vocabulary and keys to parts of the exercises.

youdao

选择书籍需要一定的技巧，要考虑作者的写作风格，有时甚至要考虑随书光盘中是否包含了练习的参考答案(如果包含了练习的话)。

Selecting one becomes a choice of approach, author's writing style, and even sometimes whether or not the solutions to the exercises (if exercises are included) are included with the book's CD.

youdao

选择书籍需要一定的技巧，要考虑作者的写作风格，有时甚至要考虑随书光盘中是否包含了练习的参考答案(如果包含了练习的话)。

Selecting one becomes a choice of approach, author's writing style, and even sometimes whether or not the solutions to the exercises (if exercises are included) are included with the book's CD.

youdao