Research shows that people feel unhappy and worried when they have nothing to do.________,the happiest are those who are busy.
A:In short
B:In fact
C:As a result
D:For one thing
两宋政府曾向哪些政权送过岁币( )
①金 ②西夏 ③辽 ④突厥
Jeff has a lot of ____ (meat) for lunch every day.