D．if you decide to do something, you should do it best

　　答案：B　根据文章最后一句可知答案为B项。

　　C

　　(2016·忻州第一次联考)

　　Scientists say illegal logging is threatening one of Mexico's most famous insects. Satellite pictures show large wooded areas have been cleared from the central Mexican state of Michoacan. The forests are the winter home for millions of monarch butterflies. The butterflies go there each year to reproduce. After reproducing, the adult butterflies die, but their young return to the home of their parents each spring.

　　The American space agency released the relevant satellite pictures last month. The images show the Monarch Butterfly Biosphere Reserve. A Mexican law protects trees growing in the area. The images show that about four hundred and forty­five hectares have been cleared since 2004. Scientists say that, if the clearing continues，monarch butterflies are unlikely to continue using the Reserve as their winter home.

　　For thousands of years, the butterflies have been flying to the same forests. Their trip begins along the border of Canada and the northeastern United States. The insects fly about eighty kilometers a day. They reach central Mexico after about sixty days. No one is sure why the brightly coloured orange and black butterflies chose these forests. However，scientists believe the area might offer the right mix of wetness and cool weather to keep the insects alive through the winter.

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