These are the book's practice questions — let's try them one at a time — Page 478, Lesson 595

This is the start of Chapter 19, the revision chapter for the whole book. It's just the contents page for the chapter, so there's no actual technical content to teach yet — it's a roadmap. Here's what we have: the chapter is called "Revision Questions." It opens with a set of Questions starting on page 357, and the Answers to those questions are on page 388. Then there's a Specimen Examination Paper on page 390, with its Answers on page 398, and finally Explanations to those specimen exam answers on page 399. So the structure is: a full bank of revision questions with answers, then a complete specimen exam paper, then the answers to that paper, and then detailed explanations walking through why each answer is correct. This is your self-testing section. The idea is you work through the revision questions to check your recall, then you sit the specimen paper under exam conditions, and finally you use the explanations to understand any mistakes. These are the book's practice questions — let's try them one at a time.