Read and choose. (读句子，选择正确的图片)    

( )1. I went there last weekend. I had a picnic with my family.

( )2. I went swimming with my friends yesterday.    

(     )3. I stayed at home and saw a movie last night.    

(     )4. It was small and round. We played it on the table.    

(     )5. We went to my grandparents' home last weekend.

            A                         B                         C                          D                          E

强烈酸水解法水解强心苷，其主要产物是

A．真正苷元

B．脱水苷元

C．次级苷

D．二糖

E．三糖