A:-1
B:2
C:3
D:-1或2
某天最低气温是﹣1℃,最高气温比最低气温高9℃,则这天的最高气温是____ ℃.
我国面积最大、人口最多且最年轻的直辖市是( )
Be careful of the dog! It's _______. Keep away from it.