iPad usage in offices enables employee productivity to be （）.

A．food with less salt tastes better.
B．many people make efforts to accept low-salt food.
C．many people never eat low-salt food.
D．it is good to health to eat food without salt.

A．It is too difficult for the police to use in finding criminals.
B．Few people associate it with finding criminals.
C．Some criminals make use of it when committing crimes.
D．it has long been employed in solving crimes.