题干
选词填空。
American teenagers(青少年)enjoy doing part-time jobs．They think it's an important____of growing up．They can learn some important____by doing part-time jobs and they can also make some money in this way．
American teenagers usually begin to do part-time jobs at the age of 14．On weekdays，they____go to work a few hours a week after school．They usually work for longer at weekends．
In summer,American teenagers are____if they find part—time jobs at camps or swimming pools．These jobs can bring____much fun．
Some difficult jobs____teaching， nursing and police work．____these jobs can be helpful for their future．When they grow up，the students with work experience are more likely (可能的)to be successful than those____work experience．
| excited, skill, may, they, without, but, include, part |
American teenagers usually begin to do part-time jobs at the age of 14．On weekdays，they____go to work a few hours a week after school．They usually work for longer at weekends．
In summer,American teenagers are____if they find part—time jobs at camps or swimming pools．These jobs can bring____much fun．
Some difficult jobs____teaching， nursing and police work．____these jobs can be helpful for their future．When they grow up，the students with work experience are more likely (可能的)to be successful than those____work experience．
答案(点此获取答案解析）
part,skills,may,excited,them,include,But,without
)经分析发现无论怎样混合，气体中仅含的C、O两种元素的质量比总小于3∶8，若混合气体中C、O质量比为1∶8，则A、B两气体的体积比可能为（ ）