从A－E选项中选出1－5题的主题。

(　　)1．Many people write on paper only one side．Why not try using both sides? Some students only use half the pages in their notebooks before getting new ones．Try to use up all the paper．People often give cards on festivals．How about trying to send e－cards instead?

(　　)2．There're many poor families in China．You may ask your parents to keep your unwanted clothes．Then you can pass them to poor kids．You'll feel happy that you re helping someone else．Also, you can see if your friend wants them before

throwing them away．

(　　)3．In San Francisco of the US, there is a beautiful bridge．It cost more than four years to build it, and it was finished in 1937．You can cross the bridge by car or on foot, but you must pay．Do you know the bridge? Yes, it is the Golden Gate．

(　　)4．Many people can use computers, but few of them know how to use them correctly．Remember the following when you use your computer．Keep your computer in a cool, dry room； do not put water or food near you computer； keep your screen clean and not too bright．

(　　)5．E－mail means messages sent from one computer to another．It is becoming more and more popular．You can send and receive e－mail everywhere．It is quick to use e－mail，and it is much cheaper than long－distance telephone call．

A．Use computer in right ways

B．Make old clothes useful

C．The Golden Gate

D．A new way of sending messages

E．How can paper be saved?