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【单选题】
因疾病引起的疼痛，精神上的痛苦、紧张和不安，或生活与行动的某些不便，是成本中的()。A.
直接成本
B.
间接成本
C.
边际成本
D.
无形成本
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举一反三
【单选题】What is the purpose of the article?
A.
to criticise people who always conform
B.
to encourage people to be individuals
C.
to examine the reasons for eccentric behaviour
D.
to describe problems faced by eccentric people
【单选题】A negative side of the Obama effect is that______.
A.
more people have started to criticise President Obama's racial policies
B.
relations between whites and African Americana may become tense again
C.
people are now less ready to support policies addressing racial inequality
D.
white people are likely to become more critical of African Americans
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