题目：
Suppose you work in a big firm and find English very important for your job because you often deal with foreign 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 newspaper. You may find the information 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.
﹡Choices 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, 100082
Modern 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 the USA.
﹡Language lab and computers supplied.
﹡3-month course: 1,050 yuan; 6-month course: 1,850 yuan.
Write or phone: Modern Language School, 675 Park Road. 100056
Tel: 67353019
The 21st Century English Training Centre
﹡We specialize in effective teaching at all levels.
﹡We offer morning or afternoon class, 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 centre.
Call 67801642 for more information
The International House of English
﹡Three/Six- month English courses for students of all levels at a very low cost: 60 yuan for 12 hours per week: convenient class hours: 9:00－12:00 a.m. and 2:00－5:00 p.m.
﹡A 4-month evening programme specially for developing speaking skills (same cost as day classes).
﹡Free sightseeing and social activities
﹡Very close to the Central Park. For further information call 67432308
67. You work from 9:00 a.m. to 4:30 p.m. every day. Which school will you choose?
A. Global English Center and Modern Language School.
B. Global English Center and the International House.
C. Modern Language School and the 21st Century.
D. The 21st Century and the International House.
68. 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 centre
C. its courses are more advanced D. it requires an entrance examination
69. You will probably prefer to go to the International House because it _________.
A. offers free sightseeing and social activities B. has a special course in spoken English
C. costs less than the other schools D. has native English teachers
70. If you take the evening programme at the International House, you will pay about _______.
A. 60 yuan B. 240 yuan C. 720 yuan D. 960 yuan
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0726/b1a4e2f73461883858ba477fa7ae8667.html
下面是错误答案，用来干扰机器的。
（1）递减；周期性（2）①③ （3）419；496 （4）各轨道全满难失电子
