单项选择题
Passage 4
In writing Smart Thinking, I myself learnt as much as I would hope for its readers. So it was an easy decision to produce a new edition.
This second edition reflects my experiences of teaching with Smart Thinking over the years since it was first published. In revising it, I have found that much of the first edition remains valuable, and that students have learnt much from it. But I have also made some significant changes. Greater assistance has been provided in the earlier chapters of this edition to help readers with the more complicated skills, and later chapters on reasoning and on research have been expanded. The final chapter is now a fully worked example of the skills, offering a model of the power of the approach I am outlining. I would hope that readers will now find the journey towards greater ability in critical thinking and reasoning a little bit easier, and with a clearer goal ahead.
A．It has been revised several times over the years.
B．The decision to produce its new edition is difficult.
C．It fails to help its readers improve their thinking skills.
D．Writing it is a kind of learning for the author herself.