窑洞是黄土高原地区最受欢迎的民居形式，与此有关的因素有（    ）

①占地少，建造成本低，适合当地的气候条件  ②黄土具有直立性，不易塌陷 ③窑洞是最坚固耐用的民居④窑洞隔音、隔热、保暖效果好

人类的生活和生产都离不开金属材料．

（1）铁锅、铝锅是生活中常用的炊具，如图是铁锅的示意图．铁锅生锈的条件是：铁与空气和____直接接触；炒菜时铁锅中的油着火可用锅盖盖灭，其原理是____ ．铝锅轻便、耐用，其原因是____ ．

（2）某同学为了验证镁、铁、铜的活动性顺序，他选择了打磨过的铁丝，你认为他还需要的另外两种溶液是____ ．

阅读下面短文，从A、B、C、D四个选项中，选出最佳选项。

    Julie is my aunt and she works at a radio station. She 1 it is an interesting job. Today I ask her about 2 life.     

    She says she is very busy from Monday to Friday. She goes to work at 7:30 and 3 at 20:00. Then she watches TV 4 half an hour. She goes to bed at 21:00. On Saturdays, she either plays tennis 5 goes swimming. They are 6 for her. What does she 7 do on Sundays? She always goes to the dance club. She is good at 8. My last question is not easy for her. I ask, “You like dancing. 9 not be a dancer?” She says, “I likes to talk to people through (通过) the 10. I can help more people in this way. Dancing is just my hobby (爱好), not my job.”