highintheskya（）ofbirdswasflyingsouthwardA.packB.swarmC.flockD.crow选哪个,请附带详解,

Question

high in the sky a（）of birds was flying southward
A.pack B.swarm C.flock D.crow
选哪个,请附带详解,

Answer 1

正确答案Cflock 一群（同种的) 又如,a flock of wild geese 一群雁
a swarm of 大群的,移动中的.杂乱的 如 a swarm of ants
a pack of 一群,一堆.一包.如.a pack of dogs / a pack of cigar
a crowd of 专指人群 a crowd of people