[单项选择]According to the passage, birds often half sleep because _________.
A. they have to watch out for possible attacks
B. their brain hemispheres take turns to rest
C. the two halves of their brain are differently structured
D. they have to constantly keep an eye on their companions

[单项选择]According to the passage, birds often half sleep because ______.
A. they have to watch out for possible attacks
B. their brain hemispheres take turns to rest
C. the two halves of their brain are differently structured
D. they have to constantly keep an eye on their companions

[单项选择]According to the passage, insufficient sleep is harmful in that it can cause all BUT ______ of the following.
A. poor eyesight
B. premature aging
C. odd behavior
D. loss of orientation

[单项选择]According to this passage, sleep is described as __________.
A. drowning in an ocean of darkness
B. undisturbed by tension or problems
C. a gradual parting from the real world
D. dependent only upon individual age and health

[单项选择]According the passage, the housework often brings satisfaction to women ______.
A. who are very rich
B. who envy their neighbors
C. who work outside the home
D. who are dependent on their husbands

[单项选择]According to the passage, people often wrongly believe that in pursuing a career as manager ________.

[单项选择]According to the passage, companies often look for IT managers from （）.
A. non-computer technicians
B. their own professionals
C. other companies
D. another country

[单项选择]According to this passage, deep dream sleep is more likely to occur in ______.
A. flies
B. vulnerable birds
C. puppies
D. tigers

[单项选择]According to the passage, if you sleep more than 15 minutes after lunch______.
A. you will be refreshed
B. you will be waken up
C. you will feel far sleepier
D. you will take a cat nap

[单项选择]A new study on birds' sleep has revealed that _________.
A. half-brain sleep is found in a wide variety of birds
B. half-brain sleep is characterized by slow brain waves
C. birds can control their half-brain sleep consciously
D. birds seldom sleep with the whole of their brain at rest

[单项选择]

Passage One
Wild and farm birds often get a flu virus. Yet they usually are able to carry the virus without getting sick.
In 1997 six people in Hong Kong died of a different kind of bird flu virus. It is called the h-five-n-one virus. The Hong Kong government quickly ordered the killing of all farm birds there. That stopped the spread of h-five-n-one to people in Hong Kong.
Yet the virus bad already spread to other parts of Asia. It was found in 16 countries between 2003 and 2006.
The h-five-n-one virus first appeared in Africa. This raised many concerns about the spread of the disease. Scientists do not know exactly how bird flu came to Africa. At first, they thought wild birds were to blame. Now, officials with the U. N. Food and Agriculture Organization believe the main cause is trade in farm birds.
The bird flu virus is found in the waste and liquids of infected birds. The virus spreads when healthy birds or people touch sick bir
A. to kill all the birds in an area where bird flu has been discovered
B. to kill all the chickens
C. to kill all the birds
D. to kill all the chickens when bird flu has been discovered