阅读下面材料，从每题所给的A、B、C、D四个选项中选出最佳选项．

Sing a Song of People by Lois Lenski

Sing a song of people Walking fast or slow； People in the city Up and down they go． 5 People on the sidewalk， People on the bus； People passing，passing， In back and front of us． People on the subway 10 Underneath the ground． People riding taxis Round and round and round． People with their hats on， Going in the doors； 15 People with umbrellas When it rains and pours．

People in tall buildings And in stores below； Riding elevators 20 Up and down they go． People walking singly， People in a crowd； People saying nothing， People talking loud． 25 People laughing，smiling， Grumpy people too； People who just hurry And never look at you! Sing a song of people 30 Who like to come and go； Sing of city people You see but never ____!

（1）The poem is about a 　　city．

A．beautiful

B．busy

C．rainy

D．small

（2）In Line 21， the word "singly" means 　　．

A．alone

B．fast

C．slowly

D．quietly

（3）According to the poem， the best word for the blank is 　　．

A．borrow

B．throw

C．know

D．allow