Big schoolbags have been a big problem for students for a long time. Maybe your schoolbag is too   1   to carry, and it troubles you a lot   2  you want to find out a book to read. Now e-textbooks will   3  you.

It is said that many Chinese middle schools are going to use e-textbooks. An e-textbook, in fact, is a small   4  for students. It is much   5  than a usual schoolbag and easy to carry. Though it is as small as a book, it can   6  everything for study. The students can read the text page by page on the   7  ，take notes   8  the pointer (屏写笔)，or even “hand in” their   9      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   10  for the students’ eyes. What do you think of it?

完形填空

Big schoolbags have been a serious problem for students for a long time.Maybe your schoolbag is too 　1　 to carry，and it troubles you a lot 　2　 you want to find a book out to read，Now an e-textbook will 　3　 you.

It is said that e-textbooks are going to be 　4　 in Chinese middle schools.An e-textbook，in fact，is a small 　5　 for students.It is much 　6　 than a usual schoolbag and easy to carry.Though it is as small as a book，it can 　7 　 all the materials（材料）for study.The students can read the text page by page on the 　8　，take notes with the pointer（屏写笔）.Or even “　9　” their homework to their teachers by sending e-mails.All they have to do is to press a button.　　

Some people say e-textbooks are good，but some say they may be 　10 　 for the students’ eyes.What do you think of it?

根据句意和语境，在句子空白处填入恰当的词。

1．Michael comes from Canada．He is a           boy．

2．          TV too long is bad for your eyes．

3．The room was full          smoke after the big fire．

4．What will the weather be           tomorrow?

5．There is going to        a football match between Germany and Italy tomorrow．

Wearing the wrong type of glasses will do harm to your eyes. Incorrect glasses may not be good for the children under 10. You may see better with glasses that are specially made for you.
Watching too much television may be bad for your eyes. This is not true for everyone. People with easily affected eyes may find they get red and achy (痛) from watching TV for long. Carrots will help you see in the dark. Carrots are rich in beta-carotene (β胡萝卜素). The body can change beta-carotene into vitamin A, and too little beta-carotene can cause night blindness. However, a lot of research shows that night blindness is more likely to be connected with some other vision problems.
【小题1】Night blindness can be caused by _____.