单项选择题

What is the main purpose of the passage

A．To review Oates's By the North Gate.
B．To compare some modern writers.
C．To describe Oates's childhood.
D．To outline Oates's career.
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单项选择题
According to the information in the third paragraph, which of the following improvements made it possible to lengthen the tone produced by the piano
A．The introduction of pedals
B．The use of heavy wires
C．The use of felt-padded hammerhead's
D．The metal frame construction
单项选择题
Which of the following instruments was widely used before the seventeenth century
A．The harpsichord
B．The spinet
C．The clavichord
D．The organ
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