Big schoolbags have been a big problem for students for a long time. Maybe your schoolbag is too       to carry, and it troubles you a lot      you want to find out a book to read. Now e -textbooks will      you.
It is said that many Chinese middle schools are going to use e - textbooks. An e - textbook, in fact, is a small      for students. It is much lighter than a usual schoolbag and       to carry. Though it is as       as a book, it can hold (容纳) everything for study. The students can read the text page by page on the        , take notes 8the pointer (屏写笔) ,or even "hand in" their        to their teachers by sending e - mails. All they have to do is to press a button ( 按开关).
Some people say e- textbooks are good, but some say they may be       for the students' eyes. What do you think of it.?
A. expensive   B. heavy    C. light
A. till       B. after      C. when
A. trouble   B. help       C. solve
A. TV      B. radio       C. computer
A. easy     B. difficult     C. hard
A. smaller   B. small        C. harmful
A. paper    B. keyboard    C. screen
A. with     B. in          C. by
A. computer  B. homework   C. e - textbooks
A. bad     B. dangerous   C. good