1．In 1778,  Joseph Banks was elected ______ president of the Royal Society , ______ position he held for 42 years．

A．the; the    B．a; a     

C．不填；a    D．a; 不填

2．Sometimes advertisements make _______ possible for companies to sell the customers ______ money cannot buy．

A．/; that    B．it; what    

C．that; which   D．/; whose