单项选择题

Apple was the first to make popular ______.

A．Windows operating system
B．a graphical user interface
C．the use of icons
D．the use of personal computer
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单项选择题
According to the findings by the American researchers, what is of help in relieving patients’ pain and worry
A．Brain.
B．Skin.
C．Medicine.
D．A sharp needle.
单项选择题
Emily Dickinson, America's greatest ______, wrote more than a thousand verses and her works were infused with emotional depth and subtlety.
A．essayist
B．short story writer
C．lyric poetess
D．novelist
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