共射极三极管放大电路，在接上负载电阻后，放大器的电压放大倍数将（）。A、增大B、减小

阅读下面5段语言材料，从A到F选项中，找出与它们相对应的标题。
小题1:Dear Mrs. Web provides free personal advice and opinions for you. She receives and answers worldwide email questions. She will offer you some new suggestions on your problems, like study stress, disinterested friend.
小题2:Every year thousands of old people are in need of our help. The Help Line provides a heartwarming, helpful, kind support and information service for the English–speaking aged people.
小题3:. Earth club is for any student in Green School. Earth Club’s goal is to help keep the school, neighborhood, and city cleaner by encouraging recycling, highway clean up, and river, lake and school campus clean up. We hope to improve the environment and encourage others to do the same.
小题4: My great, great grandfather invented the carpet sweeper 125 years ago. This King Sweeper is the best by far. I invite you to try it in your home. You’ll fine it used daily in hospital, restaurants, offices and homes throughout the world. This is just the thing to keep your carpet soft, clean and fresh. Only for $29.99!
小题5: They can protect your eyes when driving, gardening or reading in sun. It can make your life easier and happier, and make you look smarter! $10.99 each or 2 for $19.99!

A. The King Sweeper B. Dear Mrs. Wed C. Save the Earth Club D. Help Line Volunteers E. The new inventions F. Trendy Sunglasses