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The closest distance from which an asteroid has been photographed using ground-based radar is 2.2 million miles, the distance from which the asteroid Toutatis was recently photographed. The closest photograph of an asteroid is of Gaspra, which was photographed from a distance of only 10,000 miles.

Which of the following can be properly concluded from the statements above?

单项选择题{{*HTML*}}Osteoporosis is a disease that reduces bone mass, leading to fragile bones that break easily. Current treat- ments for osteoporosis such as estrogen or calcitonin help prevent further loss of bone but do not increase bone mass. Since fluoride is known to increase bone mass, administering fluoride to osteoporosis patients would therefore help make their bones less susceptible to breaking.Which of the following, if true, most seriously weakens the argument above?

单项选择题{{*HTML*}}Gray wolves have been absent from a large national park for decades. Park officials wish to reestablish the wolves without jeopardizing any existing species of wildlife there. Since the park contains adequate prey for the wolves and since the wolves avoid close contact with people, reintroducing them would serve the officials purpose without seriously jeopardizing visitors safety.Each of the following, if true, strengthens the argument above EXCEPT：