A:At most
B:At least
C:At last
D:At present
Our English teacher Miss Wang is very ________ to us. We are ________.
《记金华的双龙洞》记叙了作者游览双龙洞的经过,表达了作者对祖国山川景物的热爱之情。
设f(x)在x=x0处可导,且lim△x→0fx0+3△x-fx0△x=1,则f′(x0)等于( )