选出不同类的单词。
(1)A. red       B. look         C. green             D. yellow
(2)A. bus       B. ship         C. foot              D. plane
(3)A. China     B. Canada      C. US                D. country
(4)A. stop       B. go          C. right             D. wait
(5)A. sled       B. ferry        C. post office        D. subway