找出与其他三个不同类的单词或短语。 (______) 1. A. train B. taxi C. shop (______) 2. A. must B. often C. sometimes (______) 3. A. red light B. traffic light C. yellow light (______) 4. A. Chain B. USA C. Beijing (______) 5. A. stop B. wait C. light (______) 6. A. early B. late C. bookstore (______) 7. A. foot B. taxi C. train (______) 8. A. children B. parents C. books (______) 9. A. morning B. afternoon C. lunch (______) 10. A. by B. on C. take