A．cannot live in sunlight
B．are killed by drying
C．are in no way dependent on the water content
D．have their activity greatly reduced by drying
A．prevent darkening of certainfruit
B．crack the skins of certain fruit
C．produce special wax coating
D．decrease the rate of drying
A．on horizontal cylinders
B．in hot-air chambers
C．in the sun and wind
D．by using the open tray method
A．are often packed in cans or frozen
B．are used by soldiers and climbers
C．need more storage space than available
D．are much cheaper than canned or frozen products