During the sterilization process which follows, the cans are______to steam or boiling water with the temperature and duration varying according to the type of food.
【正确答案】 B
【答案解析】解析：be proportional to“与……成比例”；be subjected to“使受到，使经历”：be susceptible to“易受影响的”；be liable to“易受，应受”。由句意可推断出，此处应填与“受到影响”有关的词组。故选B。