武广和沪昆两条高铁实质上把长沙和哪两个经济最发达、最具活力的城市群绑在了一起？
参考答案：珠江三角、长江三角城市群。
As the director can't come to the reception, I'm representing the company ______.
A．on his account
B．on his behalf
C．for his part
D．in his interest
年度等级为监管部门对餐饮服务单位食品安全管理状况过去12个月期间监督检查结果的综合评价，年度等级分为优秀、良好、一般三个等级，分别用（）三个字母表示。
