各位英语语法大师们进！

Question

1.be available for/to 的区别？
2.Shanghai as (a/the) population of over 16 million.(choose one and say why)
3.The official mascots of the 2004 Olympic Games were Athena and Phevos,___________________(A that of both B of which both)为什么选B？（解释请详细）

Answer 1

1 for 是在什么方面怎么样 to是对于什么方面
2 a 在这种情况下应用a 比如have a talant for
3 A是宾从 B是定从 事实上主句成分齐全 应用定从