摘要： The best title for the text is . A. Two-powered cars B. Greener vehicles for China C. Oil-saving cars D. Safer motors at present E When do you become an adult, a grown-up? At eighteen? Twenty-one? Thirty? Adulthood may seem a long way away to you, but the fact is that you are in the process of becoming an adult right now. The changes are so gradual that you may not notice them, but you can be sure that they’re happening. When you were a child, a parent or older relative probably bought your clothes and helped you clean up your room. Now you are likely to care for your bedroom, and to share other housework. You may once have had trouble getting your homework finished on time. By now, you may have learned to rush yourself. You know how much time you need. Do you remember begging your parents to stop for ice cream, or take an after-school job when you want money for a new clock radio? Of course, you don’t always plan your time and your money perfectly. But you’re learning. As you get older, you have more privileges and more responsibilities. You may baby-sit for younger brothers and sisters, help cook dinner, and do odd jobs to contribute to the family income. You may get to stay up to watch a late movie on television, sit in on adult conversations, take subways and buses alone, or go on camping trips with your friends. Eventually, you will have a job and an apartment of your own. You’ll become a voter and perhaps a husband or wife, maybe even a parent. But doing things adults do does not necessarily mean you will be wiser, braver, or more self-assured . It takes time to gain knowledge and build self-confidence. Adults need to test themselves in the world, just as you do as a teenager. Being an adult is a continual process of growth.

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