Where Have Allthe Bees Gone
Scientists who study insects have a real mystery on theirhands.All across the country，honeybees are leaving their hives and neverreturning. Researchers call this phenomenon colony-collapse1 disorder.Accordingto surveys of beekeepers across the country，25 to 40 percent of the honeybeesin the United States have vanished from their hives since last fall.So far，noone can explain why.
Now，a group of scientists andbeekeepers have teamed up to try to figure out whats causing the alarmingcollapse of so many colonies. By sharing their expertise in honeybee behavior，health，and nutrition，team members hope to find out whats contributingto thedecline and to prevent bee disappearance in the future.
Another cause of colony-collapse disorder may be certain chemicalsthat farmers apply to kill unwanted insects on crops，says Jerry Hayes，chief beeinspector for the Florida Department of Agriculture3.Some studies，hesays，suggest that a certain type of insecticide affects the honeybees nervoussystem and memory.It seems tike honeybees are goingout and getting confused about where to go and what to do, he says.
练习：
A Honeybeesare flying all across the country.
C Honeybees are leaving their hives and do not return.
2. Why are researchersseriously concerned with the phenomenon of colony-collapsedisorder?
B Becausehoneybees feed on flowers.
D Both B and C.
A Worsening environment.
C Dwindlingnumber of flowers around.
4. According to the fifth paragraph，which of thefollowing about bees genes istrue?
B Beesgenes help keep them in their hives.
D Beesgenes couldexplain the collapse of some colonies.
A Farmers apply certain chemicals to killunwanted bees.
C The insecticide affects the honeybees memory.
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 section a课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 period 1课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 period 4课件
2014人教新目标英语八年级下册unit 4《Why don’t you talk to your parents》section a 1a-2d课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 1b课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 2b课本听力素材（mp3）
2014人教新目标英语八下unit 5《What were you doing when the rainstorm came》 section a（grammarfocus-4c）课件
2014人教新目标英语八下unit 5《What were you doing when the rainstorm came》 section a（2d）课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》 period 2课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section b 1c课本听力素材（mp3）
2014人教新目标英语八下unit 5《What were you doing when the rainstorm came》 section b（1a-1d）课件2
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 3a课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 1b课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》全单元课件
2014人教新目标英语八下unit 5《What were you doing when the rainstorm came》 section b（1a-1d）课件1
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 1a-1e课件
2014人教新目标英语八下unit 6《An old man tried to move the mountains》 section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 3a-3b（含self check）课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》专题复习课件
2014人教新目标英语八下unit 6《An old man tried to move the mountains》课件2
2014人教新目标英语八下unit 6《An old man tried to move the mountains》课件3
2014人教新目标英语八下unit 6《An old man tried to move the mountains》课件1
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 2d课本听力素材（mp3）
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 period 2课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》words单词听力朗读素材（mp3）
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 period 3课件