单项选择题

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

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.
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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.
单项选择题
A. It is read only by children. B. It is of no value.C. It is not helpful. D. It is read by many.
A. It is read only by children.
B. It is of no value.
C. It is not helpful.
D. It is read by many.
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