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

跟往常一样，你最起码也得先自己尝试做一下这些练习，然后再看参考答案。

As usual, you should at least attempt the exercises before you read my solutions.

youdao