单项选择题

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．It is the nerve cells of a computer.B．It is the brain of a computer.C．It is the eye of a computer.D．It is the heart of a computer.
A．It is the nerve cells of a computer.
B．It is the brain of a computer.
C．It is the eye of a computer.
D．It is the heart of a computer.
单项选择题
A．The exams that she doesn’t pass.B．The titles of the term papers she wrote.C．The reason why her family didn’t travel anywhere 10 years ago.D．The places her family has traveled.
A．The exams that she doesn’t pass.
B．The titles of the term papers she wrote.
C．The reason why her family didn’t travel anywhere 10 years ago.
D．The places her family has traveled.
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