Click on to see the explanations.

1.A. The first skill appears here.

This column (the navigation column) contains an outline of the lesson topics and a summary of each topic. It provides both an overview and convenient access to the detailed information on each topic.

Using the navigation column, you can either preview or review lesson topics without scrolling through volumes of text. Click on the "Detail" button to access the corresponding topics, examples, exercises, and quizzes in the right column.

1.B. The second skill appears here.