①果蝇 ②蝗虫 ③蜜蜂 ④蟋蟀
A:①②
B:①③
C:②③
D:②④
与“三思而后行”意思相近的句子是( )
Is this story the same as ______in that book?
等差数列-5,-2,1,…的前20项的和为( )