In Europe, the umbrella was first used against the rain ______.

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

A．businesses usually do not pay much for advertisement
B．businessmen know well that advertisement can bring them more profits
C．advertisement can hardly convince people of the value of the goods
D．advertisement usually costs businesses large amounts of money