必修5 Module 6 课下主题训练 人与环境、人与动植物（Word练习）-【新高考方案】2024高考英语一轮复习（老教材 新高考 外研版）

色学科网书城■ 品牌书店·知名教辅·正版资源 b.zxxk.com 您身边的互联网+敷辅专家 Module 6 课下主题训练人与环境、人与动植物 1.阅读理解 Millions of monarch butterflies (once covered the trees of California's coastal areas each winter,but now their numbers are decreasing.The recent annual Western Monarch Count found that the butterfly population was down by 99 percent from populations 40 years 1g0. Monarch butterflies have two populations:eastern and western varieties separated by the Rocky Mountains.The populations are very similar in appearance,but western monarch butterflies are generally smaller and darker in color.The two also follow different migration (patterns.Eastern monarch butterflies spend winter in Mexico,while western ones gather on central California coasts to wait out the cold. In early spring,the two leave their rest places and begin to travel eastward.By the time the butterflies reach the Central Valley,they breed ()A butterfly can lay hundreds of eggs in a few weeks,and the new generation continues the migration.The cycle of generations and migration repeats every few weeks through the summer until the butterflies move as far as Idaho.And when the weather turns cold and the days get shorter,the butterflies return to California's coasts. The overwintering population was counted every year.The missing information is the time period when the butterflies leave their winter woods and begin to breed in February, March and April."We just don't know what they're doing in that middle period and how we can better support the population,said Washington State University biologist Cheryl Schultz."Maybe they're resting in the woods,or maybe they need more fuel along the way, etc.Any of those things might help monarch butterflies get from the coastal overwintering sites to breeding sites broadly in the Central Valley,Schultz added.To fill that gap,the researchers set up the Western Monarch Mystery Challenge. The ten-week program asks the public to submit photographs of monarch butterflies outside of their winter rang