16 As a result of scientific intervention (介入)，some harmful substances have been added to our food.
A．Right
B．Wrong
C．Not mentioned
17 Nitrates are usually used for keeping the smell of food.
A．Right
B．Wrong
C．Not mentioned
18 "FDA" means Food and Drug Administration.
A．Right
B．Wrong
C．Not mentioned
19 All the drugs given to the living animals are for the health of the living animals.
A．Right
B．Wrong
C．Not mentioned
20 Food may cause forty percent of cancer in the world.
A．Right
B．Wrong
C．Not mentioned
21 The FDA has tried to control the process of food.
A．Right
B．Wrong
C．Not mentioned
22 Eighty percent of all animal illnesses are related to food.
A．Right
B．Wrong
C．Not mentioned