A．It shows where advertisements come in．
B．It gives a signal for him to slow down．
C．It alerts him to something important．
D．It serves as a reminder of sad news．
A．It gives pleasure to both adults and children．
B．It is often carried around by small children．
C．It can be found in many parts of the world．
D．It was invented by an American Indian．
A．They were made for earning a living．
B．They were delicate geometric figures．
C．They were small circus figures made of wire．
D．They were collected by a number of museums．