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【环境保护】阅读材料,回答问题。

    世界卫生组织在2005年版《空气质量准则》中指出:当PM2.5年均浓度达到每立方米35微克时,人的死亡风险比每立方米10微克的情形约增加15%。一份来自联合国环境规划署的报告称,PM2.5每立方米的浓度上升20毫克,中国和印度每年会有约34万人死亡。

说出我国可吸入颗粒物主要的。分析我国华北地区夏季雾霾天气较冬季少的原因。

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生产生活中的矿物燃料燃烧;机动车尾气;建筑及其它活动的扬尘和其它挥发性有机物。夏季降水量大,植被茂盛,吸烟滞尘效益高;冬季取暖燃煤量大,可吸入颗粒排放量大。

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阅读理解

Jacob's Pillow Dance Festival

Where: Becket, Massachusetts

When: June 15-Aug 24

    Each summer, this influential dance center presents a number of classes and performances by more than 50 companies from around the world. Highlights (最精彩的部分) this season include the Dance Theater of Harlem's production of Alvin Ailey's “The Lark Ascending”, which opens the festival.

    Many events are free. Ticketed performances start at $22. jacobspillow.org.

Moab Music Festival

Where: Moab, Utah

When: Aug 29-Sept 9

    This area is better known for mountain biking than for music. But since 1992, it has hosted a private festival that brings classical, jazz, Latin and other types of music to the land. This year there will be 16 concerts, including three “Grotto Concerts”, where guests take a 45-minute boat ride down the Colorado River to performances.

Events start at $25. moabmusicfest.org.

Cheyenne Frontier Days

Where: Cheyenne, Wyoming

When: July 19-28

    There's something for everyone at this 117-year-old festival, from an “Indian village” and Old West museum to country concerts. But the competition is still the main attraction, with cowboys and cowgirls competing for major money in the world's largest outdoor stage.

Competition tickets start at $18, and concert tickets at $23. cfdrodeo.com.

The Glimmerglass Festival

Where: Cooperstown, New York

When: July 6-Aug 24

    Each summer, opera lovers from around the country (and the world) travel to upstate New York to watch productions that include stars like Nathan Gunn and Ginger Costa-Jackson. This year's performances include Wagner's “The Flying Dutchman” and Verdi's “King for a Day”, in honor of the 200th birthdays of both composers (作曲家).

Tickets start at $26. glimmerglass.org.