Just last month, an even greater threat rose in Michoacan' s butterfly home. The

　　country s largest mining corporation gained the right to reopen an old mine in the heart of the monarch

　　reserve. Experts believe that if the mine is reopened, it will likely spel) the end of this magical place.

　　And as if all this wasn't bad enough, the increasing use of herbicides (除草剂）in the American com belt has led to the decrease of a plant which is essential to the monarchs’ development from egg into butterfly.

　　Why do Monarch Butterflies gather together in large masses?

　　A. To keep warm.

　　B. To fight for food.

　　C. To protect young butterflies.

　　D. To frighten away the enemy,

　　33. How long will the butterflies stay in Mexico?

　　A. About two months.

　　B. About three months.

　　C. About seven months.

　　D. About five months.

　　34. What can we infer about the butterflies protection law in Mexico?

　　A. It has been strictly carried out.

　　B. It is only paid a little attention to.

　　C. It was declared too late.

　　D. It is unfair to people dependant on woodcutting.

　　34. What can be the best title for the text?

　　A. A Popular Place for Seeing Butterflies

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