你一定知道这项练习的答案，是不是？

You must know the answer to the exercise , don't you?

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我们发现一张附有答案的练习纸。

We found a sheet of practice questions provided with solutions.

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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.

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