A.
To announce exam dates
B.
To introduce a reading challenge
C.
To change library rules
D.
To request book donations
正确答案:B
译文
Read an email.

Dear Students,
We are organizing a school-wide reading challenge from April 1st to April 30th. The theme this year is "Around the World in 30 Books." For each book you read, you'll mark a country on our world map in the library.
Prizes will be awarded in three categories: most books read, most countries visited, and most creative book review. You can participate individually or form teams of up to four students. Sign-up sheets are available in the library starting today.
This is a great opportunity to explore new cultures through literature while competing for exciting prizes. Happy reading!
Best wishes,
Lily Wilson