問題詳情

Reading 12% (2% each) 
(A) Monarch butterflies are a common summer sight in the northern United States and Canada. These large orange andblack insects brighten parks and gardens as they flit among the flowers. What makes monarchs particularly interesting isthat they migrate—all the way to California or Mexico and back. They are thought to be the only insect that does this.Every year in the late summer, monarchs begin their trek to the south. Those heading for Mexico go first for theLouisiana-Mississippi region, then across the Gulf of Mexico into Texas (some have been spotted overnighting on oilplatforms in the gulf). Once in Mexico, they establish themselves in one of about fifteen sites in a mountain forest filledwith fir trees. Each site provides a winter home for millions of monarchs. The butterflies are so numerous that they oftencover entire trees. When spring comes, they begin their long journey north. The question is often asked whether every butterfly makes the round-trip journey every year. And the answer is no.The average monarch lives about nine months. So one flying north might lay eggs in Louisiana and then die. The eggs ofthat generation may be found in Kentucky; the eggs of the next generation may end up in Wisconsin or Michigan. The lastgeneration of the season, about the fourth, will make the trek back to Mexico and restart the cycle. Scientists learn about monarchs’ migration by capturing and placing identifying tags on the insects. By recapturing atagged monarch and noting where it came from, the next scientist can figure out things like the butterfly’s age and itsrouting.                                                                                      (From Six-Way Advanced) 
51. This passage is mostly about _______________________.
(A) the places where monarchs spend the winter
(B) tagging and identifying monarchs
(C) migration patterns of monarchs
(D) what monarchs look like

參考答案

答案：C[無官方正解]
難度：適中0.5
統計：A(2),B(1),C(3),D(0),E(0)

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