一个四位数，使它恰好得等于两个相同自然数的乘积，则这个四位数是____ ．

如图闭合电路中，当滑片P向右移动时，两电表示数变化是（  ）

通读下面短文，掌握其大意，然后在各题所给的四个选项中选出一个最佳答案。

    Growing up is not always easy. When facing difficulties, courage and a spirit of independence (独立)can be more useful than crying for help. That's what's the story I've heard recently tells me.

    The young man was born in 1982 in a 1 family in a small town .When he was only 11, his father became mentally ill and one day came back with an abandoned baby (弃儿) girl. A year later, his 2 left home with his younger brother because she couldn't  3 hard life and pressure from her mad husband. The 12-year-old boy began to 4 his whole family: he took care of not only his sic k father, but also the little girl. 5, he didn't give up studying. Later he went to college. To care for the little girl, he rented a room near his college and 6 her education by doing part-time jobs.

    After the young man's story went public, people were deeply impressed by his behavior.

7 his life was hard, he didn't abandon his father and his sister because 8 needed his help very much. And he 9 donations from others. He said he felt 10 because of kind offers, but he could depend on his own work. With his hard –won money, he 11 helped other students in trouble .

    Today when many young people worry more about their own happiness, this young man's behavior reminds us of what we don't usually 12: love and care for others. Nobody could continue to live 13 these.

    Through his hard life, the young man is regarded as a 14. So when facing difficulties, don't 15 bad luck. Consider what more you could do for your family and society, and you'll find the world smiling back.

TaIL Spin

    Two dolphins race around in a big pool in the Ocean Park. The smaller dolphin Grace, shown off a few of her tricks, turning around and waving hello to the crowd. The most amazing thing about her, however, is that she's even swimming at all. She doesn't have a tail.

    Grace lost her tail as a baby when she got caught up in a fish trap. When the dolphin arrived at the Ocean Park in December 2005, she was fighting for her life. “Is she going to make it?” Her trainer, Abbey Stone, feared the worst. Grace did make it --- but her tail didn't. She ended up losing her flukes and the lower part of her peduncle.

    Over the past six years, she has learned to swim without her tail. Dolphins swim by moving their flukes and peduncle up and down. Grace taught herself to move another way---like a fish! She pushed herself forward through the water by moving her peduncles from side to side.

    The movement put harmful pressure on Grace's backbone. So a company offered to create a man-made tail for her. The tail had to be strong enough to stay on Grace as she swam but soft enough that it wouldn't hurt her.

    The first time Grace wore the artificial tail. She soon shook it off and let it sink in the bottom of the pool. Now, she is still learning to use the tail. Some days she wears it for an hour at a time, others not at all. “The tail isn't

necessary for her to feel comfortable,” says Stone, “but it helps to keep that range of motion(动作) and build muscles(肌肉).”

    Now, the dolphin is about to get an even happier ending. This month, Grace will star in Dolphin Tale, a film that focus on her rescue and recovery. Her progress has inspired more than just a new movie. Many people travel from near and far to meet her. Seeing Grace swim with her man-made tail gives people so much courage.