阅读理解。 Whether you're considering a first cell phone for your teen or trying to limit various functions on your child's existing cell phone, it's important to understand the various controls and technologies available today. The decision to get your child's first cell phone usually occurs when you're annoyed by your kid, who insists that 'everyone' has one. Whether that's accurate or not is probably of little interest to your child, but it's typically his or her biggest selling point! Often parents recognize the safety features of the child's carrying a cell phone, including the ability to communicate easily with parents by voice or text messaging. Convenience is also a large factor -knowing where in the mall to meet your child, or getting the notice that soccer practice has been delayed. It leads to efficiency, convenience and safety for both you and your child. But what about the downsides (负面影响) to kid cell-phone usage? Well, there're plenty of issues to consider, and the following tips should be of help. Start small.  When thinking about getting your child's first phone, consider having your child first use your cell phone for occasions when you'll need to know the time and place for pickup,  or in cases of emergency. If the youngster handles your cell phone appropriately, consider allowing the child to have his or her own phone with a small amount of voice minutes or text capability (容量) each month. This also helps teach budgeting. Practice together.  Practice voice messaging and text messaging with your child. Both of you need to become skillful at these techniques, and your child needs to see that you understand how to check his or her texts, when the phone is being used and also who they're communicating with. 1. In the view of the author, ________. A. every child should have his or her own cell phone B. children should not use adults' cell phones C. adults should be clear about whom their kids contact D. most adults are not familiar with functions of their cell phones 2. When the author advises parents to start small, he means that parents should ________. A. set a limit, on the phone bill B. buy cell phones of small size C. not use cell phones frequently D. not teach teens to use cell phones 3. We can learn from the passage that________. A. it's a waste of money for children to use cell phones B. cell phones give children lots of benefits C. it's impossible for people to go without cell phones nowadays D. most children pay their phone bills by themselves 4. The passage mainly intends to ________. A. advise buying teen cell phones B. point out cell phones' advantages C. help teens choose cell phones D. offer parents some useful advice