31. What might be dog owners’ attitude toward this dog-friendly remote control?

　　A.Supportive. B. Doubtful. C. Opposed. D. Worried.

　　D

　　Every year, hundreds of millions of Monarch Butterflies(黑脉金斑蝶〉froru Canada and the United States journey as far as 2,500 miles to the forests of Michoacan, Mexico ? a place which has the world’s largest insect migration(迁移） It’s such a breathtaking eight, but as always，human greed is threatening to destroy it.

　　e Monarch Butterflies start to arrive in Michoacan in late October to make their Home in the trees high up in the mountains of the natural reserve. Once there, they gather together in large masses. These masses often become so heavy that they cause tree branches to bend or even break. But there's a purpose of all these massing一it allows the butterflies to survive in the low nighttime temperatures at these high altitudes.

　　The Michoacan Monarch Butterfly Sanctuary is most impressive during the months of Febniary and March，just before the winged insects begin Iheir long journey home.

　　Mexico's Butterfly Forest is a shelter protected by law, and one of the country's most popular 3ights, but that hasn’t stopped people from slowly but steadily destroying it.

　　Illegal woodcutting in the heart of the Monarch Butterfly Biosphere Reserve has been a longstanding problem, but criminals are rarely brought to justice. They are often set free after paying some money.

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