单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．How most mathematicians work.
B．Accidental discovery about the earth’s shape.
C．How to track an orbit.
D．How astronauts use computers to measure the size of satellite.
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单项选择题
A．One in a billion digits.B．Zero.C．One mistake per two hundred digits.D．One in a million digits.
A．One in a billion digits.
B．Zero.
C．One mistake per two hundred digits.
D．One in a million digits.
单项选择题
A．The woman has passed her final exams.B．The woman wants to know how to write term papers.C．The woman is going to visit Gettysburg.D．The man introduces his experiences in Gettysburg.
A．The woman has passed her final exams.
B．The woman wants to know how to write term papers.
C．The woman is going to visit Gettysburg.
D．The man introduces his experiences in Gettysburg.
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