It is important that the hotel receptionist _________ that guests are registered correctly.

A．recycling is to be recommended both economically and environmentally
B．local governments in the U.S. can expect big profits from recycling
C．rubbish is a potential remedy for the shortage of raw materials
D．landfills will still be widely used for waste disposal

A．recycling causes little pollution
B．other methods are more expensive
C．recycling has great appeal for the jobless
D．local governments find it easy to manage