幸福快乐的人生可以细分为（）。 ["满足感","富足感","受偿感","安全感"]
简析中国国画的特点。
审计报告的要素主要包括（）。 ["标题","收件人","正文","签"]
The Tower of London, a historical sight, located in the centre of London, was built by（）. ["King Arthur","Robin Hood","Oliver Cromwell","Williamthe Conqueror"]
齿轮的分度圆直径等于模数和齿数的（）。 ["和","差","商","乘积"]
Ribozyme核酶
