[单项选择]Which of the following statements best expresses the main idea of the passage
A. By the nineteenth century, forts were no longer used by the military.
B. Surgeons at forts could not prevent outbreaks of disease.
C. Forts were important to the development of the American West.
D. Life in nineteenth-century forts was very rough.

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[单项选择]Which of the following statements best expresses the main idea of the passage
A. Glass is very useful because it has many unusual qualities.
B. Light signals have changed the use of glass in industry.
C. Glass fibers have reduced the cost of telephone communication.
D. The use of glass fibers to carry telephone messages is an interesting new development.

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[单项选择]Which of the following statements best describes the organization of the passage
A. The author presents the advantages and disadvantages of plankton as a food source step by step.
B. The author quotes public opinion to support the argument for fanning plankton and concludes a summary.
C. The author classifies the different food sources according to the amount of carbohydrate.
D. The author makes a general statement about plankton and then gives examples.

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