单项选择题

Passage Three
Questions 33 to 35 are based on the passage you have just heard.

A. New Development in Viral Research.
B. Exploring the Causes of Disease.
C. DNA. Nature’s Building Block.
D. Understanding Viruses.
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单项选择题
A. Because bacteria are easier to detect. B. Because bacteria are harder to get rid of. C. Because viruses are extremely poisonous. D. Because viruses are found only in hot climates.
A. Because bacteria are easier to detect. B. Because bacteria are harder to get rid of.
C. Because viruses are extremely poisonous. D. Because viruses are found only in hot climates.
单项选择题
A. Germ-carrying insects. B. Certain strains of bacteria.C. Foul odors released from swamps. D. Creatures living near swamps.
A. Germ-carrying insects.
B. Certain strains of bacteria.
C. Foul odors released from swamps.
D. Creatures living near swamps.
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