A.reason
B. caution
C. fact
D. cause
第1题:
File infectors are also called______viruses.
A.filter
B.parasail
C.parasitic
D.attack
第2题:
第3题:
第4题:
What represents poor sanitary procedures ________.
A.Keep and use a separate filling hose for potable(drinking)water
B.Locate potable(drinking)water tanks as low as possible in the bilge
C.Eliminate enclosed spaces in which trash,food particles,dirt may gather
D.After washing dishes with soap and warm water,sterilize them in water of at least 170℉(76.7℃)
第5题:
第6题: