Question

Read the passage from “Yellow Fever.”
In 1900, the United States Army Yellow Fever Board came to Cuba to talk with Finlay. This group, headed by Dr. Walter Reed, conducted a series of experiments to test Finlay’s beliefs. Reed’s team created special conditions and divided their test subjects into several groups of people. One group was exposed to mosquitoes that were infected with yellow fever. The other groups were exposed to either unclean air or dirty linen that had been in contact with yellow fever. The result: only people who had been bitten by infected mosquitoes caught the disease. Reed and his team of researchers now had their proof. Without this and other experiments, we would never have had a yellow fever vaccine. Which sentence best summarizes the passage?

- The passage describes how Reed and Finlay chose their yellow fever test subjects.
- The passage describes the cause-and-effect relationship of Reed’s experiments.
- The passage describes the effects of Reed’s yellow fever experiments on his test subjects.
- The passage describes the relationship between Reed and his yellow fever test subjects.

Answer 1

The passage describes the cause-and-effect relationship of Reed’s experiments.

• The paragraph above describes an experiment conducted to depict how Yellow fever was caused. It showed what effect did mosquitoes infected with yellow fever have on a group of people and what effect did unclean air or dirty linen that had been in contact with yellow fever had on the other group of people.
• As a result of Reeds experiments, yellow fever vaccine was made.
• Hence, the paragraph symbolizes a cause and effect relationship of Reed's experiment.

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