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【判断题】
键的极性越强,分子的极性也越强A.
正确
B.
错误
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举一反三
【单选题】According to the passage, tile American economy grows fast essentially because of
A.
the people's attitude towards work
B.
people's hard and careful work
C.
the role of the government
D.
the influence of the religion
【单选题】What is the paradox of American culture according to the author？
A.
The American road to success is full of nightmares．
B.
Status symbols are not a real indicator of a person’s wealth．
C.
The American Dream is nothing but an empty dream．
D.
What Americans strive after often contradicts their beliefs．
【单选题】We can conclude from the text that______.
A.
American cities are changing far the worse
B.
people have different views on American cities
C.
many people are now moving from American cities
D.
the population is decreasing in older American cities
【单选题】From the passage we can infer that ______.
A.
Lincoln was born in February
B.
the American people love Washington because he was honest
C.
Washington was buried near the capital
D.
cherry pie is a necessity for Washington's birthday
【单选题】某企业甲产品单位售价40元，单位产品变动成本15元，单位变动销售费用3元，单位变动管理费用2元，则该产品的单位贡献毛益为
A.
25元
B.
22元
C.
23元
D.
20元
【单选题】设全集 U={a,b,c,d},集合A={a,c},B={b,c}, 则C U B∪A为 ( )
A.
{a,c,d}
B.
{a，b，d}
C.
{a，b，c}
D.
{b，c，d}
【简答题】设全集U={a，b，c，d，e}，集合A={a，b}，B={b，c，d}，则A∩C U B=______．
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