The effect of oil spills can be seen______.
A. immediately
B. after quite a long time
C. few years later
D. after several months
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What does the word "must" mean in the last paragraph？
A. Need.
B. Needy.
C. Necessary.
D. Have to.
Which of the following statements is NOT true according to the passage？
A. The Fed is a very big, complex and significant system which comprises many local banks.
B. All the commercial banks are not the components of Federal Reserve System.
C. Board of Governors is the supreme policy-makers of Federal Reserve System.
District Reserve banks rather than Board of Governors perform. the day to day policies.
What's the author's attitude shown in the passage？
A. Supportive to the scientists' research.
B. Opposed to the lead pollution.
C. Just descriptive of an on-going fact.
D. Positive to the prospect of the solution of lead pollution.
Income of the Board of Governors______.
A. is borrowed from the U.S. Treasury
B. is used by the government to make various policies
C. comes from the U.S. Treasury
D. is not granted by the government
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