Hello!      name is Li Ying. I’m twelve. I’m from Ningde(宁德). Now I’m in Beijing Ren'ai International School. I’m      Class Five, Grade One. Miss Gao       my English teacher. She is       old teacher. I have a pen, a ruler and two     in my pencil-box(文具盒). Liu Ping is in Grade One, too. She is       Guangzhou(广州). She is my good    . We are in        same class. Now she      at school（在学校）. I think she is at home. Look！That is a       , but it is not my book.

小题1:A. I               B. My               C. Your            

小题2:A. from               B. to                   C. in

小题3:A. is              B. are              C. am              

小题4:A. a               B. an               C. the             

小题5:A. buses           B. desks                C. pencils

小题6:A. for            B. to                   C. from            

小题7:A. friend          B. teacher          C. student        

小题8:A. these           B. the              C. an  

小题9:A. is              B. isn’t               C. are         

小题10:A. eraser         B. ruler                C. book    

（1）按体积计算，人体吸入的空气中二氧化碳约占0.03%，呼出的气体中二氧化碳约占4%，向滴有紫色石蕊试液的水中连续吹气（如下图），溶液呈   ____   色。

（2）可乐等饮料中溶解有一定量的二氧化碳，打开瓶盖会冒出许多气泡，产生这一现象的原因是                              。