—I'd like to travel to Moscow for vacation.
—Be realistic! For our poor situation at present, we can't _____ a vacation.
A:afford
B:offer
C:accept
D:provide
—Is it ___ English book? I saw it just now.
△ABC三个顶点坐标分别为A(2,2)、B(4,2)、C(6,4),以原点O为位似中心,将△ABC缩小后得到的△DEF与△ABC对应边的比为1:2,这时△DEF各个顶点的坐标分别是多少?
高原气候区的大部分地区,≥10℃的积温小于2000℃,适宜种植的作物是( )