单项选择题

How did the military assist in the investigation of health problems

A．By registering annual birth and death rates.
B．By experiments different building materials.
C．By maintaining records of diseases and potential causes.
D．By monitoring the soldiers' diets.

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单项选择题

Even exercise professionals concede 'half a point here (Sentence 2, Paragraph 2) means they ______ .

A．agree that the calories in a small piece of pastry can be difficult to work off by exercise
B．partially believe diet plays a supporting role in weight reduction
C．are not fully convinced that dieting can help maintain one's new weight
D．are not sufficiently informed of the positive role of exercise in losing weight

单项选择题

Which of the following would a traveler be LEAST likely to ob rain at Fort Laramie

A．Fresh water.
B．Food.
C．Formal clothing.
D．Lodging.