单项选择题

About 80% of what you see floating in a ray of sunshine is ______.

A．dust
B．dead human skin
C．quill-coverts
D．fluff
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单项选择题
Who is not responsible for the pressure
A．The media.
B．The Japanese culture.
C．The general attitude of the Japanese population.
D．The sportsmanship.
单项选择题
Which of the following best describes the function of the third paragraph of the passage
A．It presents a specific example of the process discussed in the first two paragraphs.
B．It explains a problem that the researchers mentioned in the second paragraph has yet to solve.
C．It evaluates the research discoveries described in the previous paragraph.
D．It begins a detailed description of the process introduced in the previous two paragraphs.
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