Parents advised me to communicate with my head teacher about the problem ________.

人体吸入的氧气最终到达组织细胞，氧气在细胞内被利用的部位是（　　）

（____）She's my new classmate, Cindy.

（____）Does she have any hobbies?

（____）She usually grow flowers.

（____）Yes, she does. She likes dancing .

（____）Well, what does she usually do on Sundays?

（____）Does she often dance on Sundays ?

（____）Come here ,Jenny .Who's that girl over there ?

（____）No. She often dance on Saturdays.

有两层书架共有书156本，第二层的书比第一层的2倍还多6本．问第一层有多少本书？