单项选择题

Suppose you work in a big firm and find English very important for your job because you often deal with foreign businessmen. Now you arc 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 the information you need.
Global English Centre
* 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 centre and bus stops.
Tel: 67605272 Add : 105 Zhongshan Road, 100082
Modem 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 pm.
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: Modern language School, 675 Park Road, 100056
Tel: 67353019
The 21st Century English Training Centre
* We specialize in effective (卓有成效的) teaching at all levels.
* We offer morning or afternoon classes, both of which last 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.
Gall 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 am and 2:00 - 5:00 pm.
* A four-month evening programme for developing speaking skills (same cost as day classes ).
* Well-trained Chinese and foreign teachers experienced in teaching English as a second/ foreign language.
* Free sightseeing and social activities (活动).
* Very close to the Central Park.
For further information call 67432308

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______.