AA: the commercial ambulance service in the west has quicker response time than the volunteer service does in the east, therefore the town should hire commercial squad to provide better patient care and generate more revenue.
AI: Financial gain is the most important factor when choosing a career.
逻辑：
1． 广告放歌那个
2． Nonlocal snake 好像是说外来的一种蛇没天敌所以迅速繁殖，所以吃掉很多本地小动物，问削弱
3． National government应当不要给小企业和个人减税，应当给钱给local government, 因为个人拿了钱去买进口的货物，有助于外国政府的经济。问削弱还是假设来着：我选的是local government 拿了钱会买国产货有助于促进国内经济。
4． 某地方岩洞里发现一种shellfish的图画还是化石，旁边还有些powder，然后说那时候的人把石头磨成粉末然后把这种shellfish图案画到身上和脸上，所以那时候的人是有symbolic thoughts.问削弱
阅读：
1． 美国capital allocation system: internal and external
2． 社会发展导致妇女的社会地位和工作选择的变化
3． 关于经济发展和环境关系 consistency thesis, relationship between achievement and resources enable the people to achieve.
语法：
1． Between…and…
2． trying to increase…,rising of hot air and falling of cool air, v+ing, 三个ing平行
3． Among all the findings of Dr. M and his colleagues,…
