单项选择题
A．recorded B．completed C．tested D．accepted
A．they cover major points of the book in detail B．they may help reader to better understand the book C．they can take readers a lot of time to read every part of the book D．they may help the readers find the important parts of the book
A．to recommend a whole book for students to read B．to require students to read carefully C．to assign reading with a certain purpose D．to locate, books for students to find