2016 年1 月24 日,一股强大的寒潮影响我国。图3为该日8 时亚洲部分地区海平面气压形势图。

How old was Tony when he finished school?    

Sydney Tower
Address: 100 Market St, Sydney
Phone: 02 9333 9222
Fax: 02 9333 9203
Open time: 9:00 a.m. t0 10:30 p.m. (Saturdays to 11:30 pm)
Ticket: $60 (for an adult) $30 (for a child)
Website: www.sydneytower.com.au
How to get there: train to Town Hall Station and a short walk along Market Street
How to book tickets: by phone/fax or through the web
Attractions: Sydney’s best views are just the beginning! Sydney Tower takes you to the highest point
above Sydney for exciting 360° view of our beautiful city.

位于长江中上游的某茶场，茶园面积600亩，每年四月、七月、十一月要锄草三次，久而久之，茶园“消瘦”了，同时，锄草需要大量劳动力，困惑之际，茶场主人想到“羊喜欢吃嫩草，却不吃嫩茶”，于是把羊引进茶园，既节约人力物力，又保持了水土，肥沃了茶园，可谓一举两得。茶园“消瘦”的主要原因是（    ）