单项选择题

Examining bottles of wine is hard work because ______.

A．the bottles must be held upside down
B．it is difficult to see the particles of dirt
C．it requires high level of automatic
D．most bottles are all right
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单项选择题
According to the brain blood flow studies, problem solving ______.
A．increases blood flow in some areas of the brain
B．causes changes in the distribution of blood in the brain
C．demands intense concentration of blood in certain areas
D．is based on the ability to recite the time
单项选择题
The author believes that ______.
A．the results obtained in the laboratory exactly reflects the real-life situations
B．the gap between the laboratory studies and real-life situations is too large to fill up
C．the gap between the laboratory studies and real-life situations eau be closed by proper reasoning
D．the difference between the laboratory studies and real-life situations will be reduced
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