3 当英英找不到时---------查英汉转自环 球 网校edu24ol.com转自环 球 网校edu24ol.com转自环 球 网校edu24ol.com
第四部分: 阅读了解 08理工新增15篇(五星级文章)
第二篇: Electric Backpack c
第六篇: Flying the Hyper1 Skies c
第七篇: Sugar Power for Cell Phones c
第十三篇: Invisibility Ring c
第十四篇: Japanese Car Keeps Watch for Drunk Drivers c
第十七篇: A Sunshade for the Planet c
第十八篇: Thirst for Oil c
第二十篇: Explorer of the Extreme Deep c
第二十一篇: Plant Gas c
第三十三篇: Smart Window b转自环 球 网校edu24ol.com转自环 球 网校edu24ol.com转自环 球 网校edu24ol.com
第三十五篇: Where Have All the Bees Gone? b
第三十六篇: Listening Device Provides Landslide Early Warning b
第四十八篇: ‘Hidden’ Species May Be Surprisingly Common a
第四十九篇: Why Humans Walk On Two Legs a
第五十篇: Black Hokes Trigger Stars to Self—Destruct a
Where Have All the Bees Gone? (B级)
（交流2007年用书理工类阅读了解第三十五篇：Single-parent Kids Do Best）
Scientists who study insects have a real mystery on their hands. All across the country, honeybees are leaving their hives蜂巢and never returning. Researchers call this phenomenon colony-collapse1 disorder. According to surveys of beekeepers across the country, 25 to 40 percent of the honeybees in the United States have vanished from their hives since last fall. So far, no one can explain why.
Colony collapse is a serious concern because bees play an important role in the production of about one-third of the foods we eat. As they feed, honeybees spread pollen from flower to flower. Without this process, a plant can’t produce seeds or fruits.
Now, a group of scientists and beekeepers have teamed up to try to figure out what’s causing the alarming collapse of so many colonies. By sharing their expertise in honeybee behavior, health, and nutrition, team members hope to find out what’s contributing to the decline and to prevent bee disappearances in the future.
It could be that disease is causing the disappearance of the bees. To explore that possibility, Jay Evans, a researcher at the United States Department of Agriculture (USDA) Bee Research Laboratory2, examines bees taken from colonies that are collapsing. “We know what s healthy bee should look like on the inside, and we can look for physical signs of disease,” he says. And bees from collapsing colonies don’t look very healthy. “Their stomachs are worn down, compared to the stomachs of healthy bees,” Evans says. It may be that a parasite is damaging the bees’ digestive organs. Their immune systems may not be working as they should. Moreover, they have high levels of bacteria inside their bodies.