[填空题]One of the reasons why public health officials are concerned about avian flu is that it is deadly and can kill previously healthy ______.

[填空题]One of the reasons why public health officials are concerned about avian flu is that it is deadly and can kill previously healthy ______.

[单项选择]
Random tests conducted on potato fields by the Idaho State Agriculture Department have revealed the presence of the Blue Mountain mite in southern Idaho. Though short of a warning, we are advising all those living in those areas to be aware of the possible spread of these harmful arachnids.
The Blue Mountain mite inhabits sandy soil. In addition to causing damage to potato crops, this mite has been known to cause illness in humans. The Blue Mountain mite is nearly impossible to notice, especially as its light brown skin blends easily with that of the soil. It is mildly venomous. All those working in or near farms or handling agriculture products in the above-mentioned areas should take proper precautions. Where mite infestation is noticed, property o
A. An oncoming hurricane
B. Massive crop damage to potatoes
C. A serious traffic accident
D. A possible infestation of a pest

[简答题]Topic：Epidemic Diseases and Public Health Crises

[单项选择]

Chronic insomnia is a major public health problem. And too many people are using (1) therapies, even while there are a few treatments that do work. Millions of Americans (2) awake at night counting sheep or have a stiff drink or (3) an pill, hoping it will make them sleepy. (4) experts agree all that self-medicating is a bad idea, and the causes of chronic insomnia remain (5) .a

Chronic insomnia is a major public health problem. And too many people are using (1) therapies, even while there are a few treatments that do work. Millions of Americans (2) awake at night counting sheep or have a stiff drink or (3) an pill, hoping it will make them sleepy. (4) experts agree all that self-medicating is a bad idea, and the causes of chronic insomnia remain (5) .
Almost a third of adults have trouble sleeping, and about 10 percent have (6) of daytime impairment that signal tru
A. cause
B. accompany
C. follow
D. attend