【单选题】 Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US ______.
A.was discouraged
B.was enforced by law
C.was prohibited by law
D.was introduced
A.was discouraged
B.was enforced by law
C.was prohibited by law
D.was introduced
【单选题】 In this passage, the author is primarily concerned with ______.
A.the necessity of standardized tests
B.the validity of standardized tests
C.the method used in interpreting the results of standardized tests
D.the theoretical grounds of standardized tests
A.the necessity of standardized tests
B.the validity of standardized tests
C.the method used in interpreting the results of standardized tests
D.the theoretical grounds of standardized tests
【单选题】 What impressed Amitai Etzioni most about Harvard MBA students
A.Their keen interest in business courses.
B.Their intense desire for money.
C.Their tactics for making profits.
D.Their potential to become business leaders.
A.Their keen interest in business courses.
B.Their intense desire for money.
C.Their tactics for making profits.
D.Their potential to become business leaders.
【单选题】 Which of the following is NOT true about the English class system
A.It is an embarrassing subject for English people.
B.Working-class students cannot receive a university education.
C.The class system is much less rigid than it was.
D.The class system still exists below the surface.
A.It is an embarrassing subject for English people.
B.Working-class students cannot receive a university education.
C.The class system is much less rigid than it was.
D.The class system still exists below the surface.
【单选题】 The citing of dangerous effects of pesticides on laboratory animals in paragraph 3 is used to suggest that ______.
A.scientists are also concerned with the effects of pesticides on animals
B.cancer is the worst effect of the pesticides
C.most or all of the dangerous effects of pesticides are now known
D.the chemicals may also cause these effects in humans
A.scientists are also concerned with the effects of pesticides on animals
B.cancer is the worst effect of the pesticides
C.most or all of the dangerous effects of pesticides are now known
D.the chemicals may also cause these effects in humans
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