Why was the old man walking along the platform Because he was looking for______.

A．It becomes smaller and works faster.
B．It becomes larger and works faster.
C．It works as larger and works slower.
D．It becomes smaller and works slower.

A．It was as large as a TV set.
B．It was as large as a room.
C．It was as large as a book.
D．It was as small as a palm.