_________ he was exercising in the park yesterday morning, he found a purse under the tree.
A:While
B:Before
C:After
南京将从今年7月起正式发布PM2.5检测数据, PM2.5是指大气中直径小于或等于2.5微米的颗粒物。下列说法错误的是
—_______. They are my uncle and aunt.
6个 19 是 69 ,再添上()个 19 就是1。