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Which of the following best completes the passage below? [#permalink]
07 Nov 2005, 19:58
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Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earthâ€™s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of â€œbutterfly treesâ€
Very though. All other choices are out of scope except B and C. I would choose C. The low-voltage transmitter emits low voltage electricity. I would choose it also because of the contrast positively or negatively which mirrors the attracted and repelled in the passage.
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