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【单选题】
下列不属于常用防腐剂的是（）A.
苯甲酸钠
B.
山梨酸钾
C.
对羟基苯甲酸甲酯
D.
苯扎溴铵
E.
羧甲基纤维素钠
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举一反三
【单选题】This is a new model of ______ typewriter especially designed to meet the needs of traveling businessmen.
A.
flexible
B.
mobile
C.
portable
D.
active
【单选题】The reason why he hasn’t come is _______. A. because his mother is ill B. because of his mother’s being ill C. that his mother is ill D. for his mother is ill
A.
because his mother is ill
B.
because of his mother’s being ill
C.
that his mother is ill
D.
for his mother is ill
【单选题】The man is ; we have to take the man to hospital. [ ]
A.
ill;ill
B.
sick ;ill
C.
ill; sick
D.
fine; sick
【简答题】计算机病毒通常是（ ）。
【单选题】150 Cost of quality includes:
A.
Appraisal cost
B.
detection cost
C.
prevention cost
D.
maintenance cost
E.
A, B, and C only
【单选题】He was late for school because ________. [ ]
A.
his being ill
B.
he is ill
C.
he was ill
D.
his ill
【简答题】A．The British may be said to be conservative, but they are always pioneers in traveling far away. B．Many English men, women and children would like to choose the traveling destinations in the continen...
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