Which group of the following people tends to have highest rate of Aids？
A. The black elite.
B. Women not using condoms.
C. Aids-stricken black male.
D. Young black women.
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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.
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.
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