Hot mineral springs could be used ______.

A．It was made of aluminum.
B．It wasn’t large enough.
C．It wouldn’t move the wind.
D．It was too heavy to put up.

A．No one exactly knows who was the inventor of the umbrella.
B．The umbrella was first invented to be used as protection against the sum
C．The umbrella changed much in style in the eighteenth century.
D．In Europe, the Greeks were the first to use the umbrella.