近年来，我国大部分地区饱受“四面霾伏”的困扰，霾的主要成分是PM2.5，是指直径 发布时间：2017-04-30 23:17 │ 来源：www.tikuol.com 题型：填空题 问题： 近年来，我国大部分地区饱受“四面霾伏”的困扰，霾的主要成分是PM2.5，是指直径小于等于0.0000025 m的粒子，数0.0000025用科学记数法可表示为 ．
题型：填空题 下面是某省2003—2010年农村家庭消费变化情况图，从中可以推断出（）。A．该省农民收入呈总体下降趋势B．该省农民生产消费支出呈总体下降趋势C．该省农民生活消费支出呈总体下降趋势D．该省农民生活质量呈总体上升趋势 查看答案
题型：填空题 阅读理解。 Suppose you work in a big firm and find English very important for your job because you often deal withforeign businessmen. Now you are looking for a place where you can improve your English, especially your spoken English. Here are some advertisements about English language training from newspapers. You may find theinformation you need. Global English Center *General English in all four skills:listening,speaking,reading,and writing. *3-month (700 yuan), 6-month (1,200 yuan) and one-year (2,000 yuan) courses. *Choice of morning or evening classes,3 hours per day, Mon-Fri. *Experienced college English teachers. *Close to city center and bus stops. Tel: 67705272 Add: 105 Ahongshan Road, 100082Modem Language School *Special courses in English for business, travel, banking．hotel management and office skills. *Small classes (12-16 students) on Sat. & Sun. from 2:00-5:00 p. m. *Native English teachers from Canada and USA. *Language lab and computers supplied. *3-month course:1,050 yuan; 6-month course:1,850 yuan． Write or phone; Modem Language School, 675 Park Road. 100056 Tel: 67353019The 21 st Century English Training Centre *We specialize in effective (卓有成效的) teaching at all levels. *We offer morning or afternoon classes．both three months and a half at a cost of 800 yuan. *We also have a six-week TOEFL preparation class during winter and summer holidays. *Entrance exams: June 1 and Dec.1. *Only 15-minute walk from city center. Call 67801642 for more information.The International House of English *Three／Six-month English courses for students of all levels at very low cost:60 yuan for 12 hours per week；convenient (方便的) class hours: 9:00-12:00 a. m. and 2:00-5:00 p.m. *A four-month evening programmer for developing speaking skills (same cost as day classes). *Free sightseeing and social activities (活动). *Very close to the Central Park, For further information call 67432308.1. You work from 9:00 a. m. to 4:30 p. m. every day. Which school will you choose? [ ]A. Global English Center and Modem Language School. B. The 21st Century and the International House. C. Modern Language School and the 21st Century. D. Global English Center and the International House. 2. The 21st Century is different from the other three schools in that _____. [ ]A. its teaching quality is better B. it is nearest to the city center C. it requires an entrance examination D. its courses are more advanced 3. If you take the evening programmed at the International House, you will pay about _____. [ ]A. 960 yuan B. 240 yuan C. 720 yuan D. 60 yuan 查看答案