（1）用化学用语填空：
氮元素____ ；氧分子____ ；钠离子____ ；二氧化硫中氧元素的化合价____ ．
（2）闻名全国的“汾酒”是山西特产，其主要成分是乙醇，乙醇的化学式为C2H5ＯH，C2H5OH除表示乙醇外，还表示的意义有：①____；②C2H5OH中碳元素与氧元素的质量比为 ____ ．
关于燃料的热值下列说法正确的是（ ）
人生难免有挫折。当挫折来临时，下面哪种做法不可取 （ ）
一对夫妻均为单眼皮（aa），妻子经手术后变为双眼皮．下列说法正确的是（ ）
Swimming club
Do you like to swim? Do you want to swim well? Then we have good teachers to teach you. Opening time：2: 00 p.m ~ 9: 30 p.m
Ticket price: 15 yuan for children, 20 yuan for adults(成人)
Please call Mr. Wang at 877-778
Children dancing club
We are a dancing club for children of 5~14. we have lessons from 9：00 to 10: 30 every Saturday and Sunday.
If you like dancing, just join us.
Call Miss Wu at 263-566
