Customer: Would you please tell me my balance
Clerk: ______.

A. Colds are always very dangerous.
B. Colds are often unpleasant though not dangerous.
C. Actually nothing can help get rid of colds.
D. The best way to keep colds away is to be healthy.

A. tell the readers the latest news
B. get more readers to subscribe (订阅)
C. show the importance of the four magazines
D. introduce the four magazines to new readers