Bacteria came into a ventilation system when______.
A. cool air was sucked into it
B. warm air was sucked back
C. cool air was sucked back
D. warm air was sucked into it
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Why are ethical rules more difficult to apply today？
A. Because business is no longer a matter of interpersonal act.
Because the movement of capital has become the result of all activities.
C. Because people are not knowledgeable enough to make sensible judgment.
D. Because making profits has become dominant in doing all businesses.
The word "piquant" in the last paragraph probably means______.
A. interesting
B. adventurous
C. lofty
D. unusual
When one gets angry at contrary opinions, chances are that______.
A. he is probably being dogmatic about his own opinion
B. people are holding something against him
C. his feelings have been hurt
D. either he or his opponent is right
An imaginary argument is better than an actual conversation because______.
A. you can talk on any subject with your supporters
B. it allows you to voice your opinion without limit
C. it can take place any time and any place you want
D. you can find out who is likely to oppose you
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