阅读短文，选择正确的答案。

   Jim and Lily are my best friends. We live in London(伦敦). This is my classroom.

   There is amap on the wall. There are thirty-four chairs and desks in it. There are twenty boys. Jim's desk

is beside IJily's. My desk is in front ofLily's. We all like English. We like to play football.

1. How many maps on the wall?

A. 2.    

B. 1.    

C. 3.

2. How many students in this classroom?

A. 35.    

B. 34.    

C. 20.

3. How many girls in this classroom?

A. 20.    

B. 34.    

C. 14.

4. Whose desk is beside Lily's?

A. Mine.    

B. Jim's.    

C. I don't know.

5. Which lesson do they like?

A. English.    

B. Maths(数学).  

C. Chinese.

分析食用木薯而引起食物中毒的原因，并说明如何处理和预防木薯中毒？