如图,8×8方格纸的两条对称轴EF,MN相交于点O,图a到图b的变换是( )
A:绕点O旋转180°
B:先向上平移3格,再向右平移4格
C:先以直线MN为对称轴作轴对称,再向上平移4格
D:先向右平移4格,再以直线EF为对称轴作轴对称
气温由﹣1℃上升2℃后是____ .
Travelling to London
We think ⑴ is the best season to visit England.
We did most of our sightseeing(观光) ⑵ .
The best part of the trip was going to the theatre.
We don't think the English food is very ⑶ .