题干

“早穿皮袄午穿纱,围着火炉吃西瓜”,是对我国大西北沙漠地区气候特点的形象化写照。试用你学过的知识对此作出解释。
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答案(点此获取答案解析)

解:因为沙子的比热容较小,白天,吸收热量后,沙子的温度升高的多,气温较高;夜晚,放出热量后,沙子的温度下降的多,气温较低;由此可以知道沙漠地区白天黑夜的温差大,产生了早穿皮袄午穿纱的现象。

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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.