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Which of the following best completes the passage below? [#permalink]
27 Oct 2006, 04:33
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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€
The path is long, but self-surrender makes it short;
the way is difficult, but perfect trust makes it easy.
HAS TO BE (C)
(A) - answer should talk about electricity/electromagnetic fields.Nowwhere does the passage talk about brains.
(D) - The lepidopterists test can only conclude monarchs sensitivity to electricity.In (D) it is far too concluded.
(E) - same reasons as (D)
Only to (B) and (C)
Prefer (C) because "whether positively or adversely" goes with "either especially attracted to the grove with the transmitter or especially repelled by it"