C．To explain how computers help create gifts.

　　D．To describe the gifts the author has received.

　　答案　B

　　解析　写作意图题。作者通过自己的经历来说明，只有自己用心制作的礼物才是有意义的礼物，因此选B。

　　B

　　There is no doubt that teens today are extremely busy.Homework piles up and extra­curricular(课外的)activities are time­consuming.Often，teens have to take part in a sport or activity after school，and they are up until 10：00 or later doing homework.Getting teenagers involved in volunteer opportunities can give them a sense of accomplishment that is not connected with sports or school.

　　Teenagers are often in their own little world.Helping them get involved in volunteering opportunities is the perfect way for them to open up that world and give their time to a good cause.

　　The key to getting teens involved in volunteer work is to find an opportunity that will fit into their schedule and find something that interests them.Also，keep it close to home.If they have to travel a long distance to volunteer，it's less likely to be accomplished.

　　My son has helped with the local library's reading program for two summers.It is close to home and the schedule is very elastic．We go in and choose days that work with his schedule and he volunteers for about 2 hours at a time.He is responsible for helping kids get signed up for the summer reading program and helping them record the hours they read.It is only a one­week time commitment，but it is very rewarding.

　　When teens volunteer，they often see that there are others more needy than themselves.They also learn time management.Your teen will become a more rounded，less self­centred individual.

Colleges see thousands of students applying for admission every year.If your teen has shown the devotion to volunteer in the community，it can give him the advantage for college admission or scholarship opportunities.So，volunteering is