半坡人掌握的生产技术包括(    )
①打制石器 ②磨制石器 ③牛耕技术 ④青铜冶铁

半径为5的圆的一条弦长不可能是（　　）

    For most people, the word “fashion” means “clothes”. But people may ask the question, “What clothes are in fashion?” And they use the adjective “fashionable” in the same way: 
    “She was wearing a fashionable coat. His shirt was really a fashionable color.”
But of course there are fashions in many things, not only in clothes. There are fashions in holidays, in restaurants, in films and books. There are even fashions in school subjects, jobs…and in languages.
    Fashions change as time goes. If you look at pictures of people or things from the past, you will see that fashions have always changed. An English house of 1750 was different from one of 1650. A fashionable man in 1780 looked very different from his grandson in 1860.
    Today fashions change very quickly. Some of this is natural. We hear about things much more quickly than in the past. Newspaper, radios, telephones and television send information from one country to another in a few hours. New fashions mean that people will buy new things, so you see there is money in fashion.

指出下列语句运用的描写方法，并说明其作用。

(1)京京脸一红，低下了头。可是随即又抬起头来，并且举了举手……京京站起来，结结巴巴地说：“老师，我能……念一段吗？”

(2)京京气得要命。怎么能这么说呢？他虽然心里挺难受，可是一点儿也没想到妒忌别人。他可不是那种小心眼儿的人。