What audience do you think the author is writing the passage for？
A. The college admission officials.
B. Faculty and staff of the university.
C. Board of trustees.
D. Those who are opposed or undecided.
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Intelligent readers know at once how ______ we are, and how skeptical, how firm for others
A. incredible
B. credible
C. credulous
D. creditable
Which of the following does nut need to he considered in the area of heart valve replacement？
A. Rejection phenomena.
B. Anticoagulation.
C. Durability.
D. Regulatory bodies.
What does "this dichotomy" in last paragraph refer to？
A. Cow's heart wall or pig's heart valve.
B. Tissues or device.
C. Housing or occuluder.
D. Anticoagulation or calcification.
It can be inferred from the passage that ______.
A. more than 30% of total rainfall can yield stream flow in the United States
B. the water in the entire eastern haft of U. S.A. goes beyond its necessary need
C. west part of U. S. A.doesn't have perennial yield of stream flow water
D. the yield of stream flow water is 'unevenly distributed in the United States
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