单项选择题


Questions 9 to 12 are based on the conversation you have just heard.

A．Order the ticket.
B．Write a bill.
C．Confirm the times by phone.
D．Confirm the order.
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单项选择题
A．Through the sense of touch.B．Through the sense of smell.C．Through intense narrow-band pulses of sound.D．Through intense broad-band pulses of sound.
A．Through the sense of touch.
B．Through the sense of smell.
C．Through intense narrow-band pulses of sound.
D．Through intense broad-band pulses of sound.
单项选择题
A．Through a wide variety of high-frequency sounds.B．Through a wide variety of low-frequency sounds.C．Through a narrow range of high-frequency sounds.D．Through a narrow range of low-frequency sounds.
A．Through a wide variety of high-frequency sounds.
B．Through a wide variety of low-frequency sounds.
C．Through a narrow range of high-frequency sounds.
D．Through a narrow range of low-frequency sounds.
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