题目内容：
请根据下面的短文回答第题： YOUR BUILDING SERVICE
√We help people in this part of the city by:
* checking all plans ( 方案) before people build new houses or make changes to old ones;
* checking water pipes (管道) ;
* looking at any problem buildings and making sure that they are all right．
√We check 900 building plans each year．
√We look at 700 building places each month to see if things are going on well．
WHERE CAN YOU GET MORE DETAILS
√ The Building Service is at the City Hall, Kenton, CN1 6KJ．Telephone: 676316 or 676317
√We have office hours for people to come and talk about their problems．
HELP US TO HELP YOU
√If you do building work, please think of other people．
√ Be nice to people living next door．
√If you want to talk to us about your problems, please give as many details (细节) as possible．
√ If you see any building problems, please let us know right away．
WHAT YOU CAN DO IF THINGS GO WRONG
√If you are not happy with us and have anything to say about the Building Service, please come, phone orwrite to The Planning Office, City Hall, Kenton, CNl 6KJ．Telephone: 676317
How many building places does the Building Service look at each month to see if things are going on well? A．700．
B．900．
C．We don't know．
参考答案：
答案解析：