单项选择题

A. They took short, quick steps.
B. They were pulled off the treadmill.
C. They lost their balance.
D. They took longer, coordinated steps.
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In 2004, Sony launched a new commercial e-reader which was viable and used electronic ink.
单项选择题
A. He has more than one child. B. His wife is a graduate student. C. He is a full-time student. D. He works at the university housing office.
A. He has more than one child. B. His wife is a graduate student.
C. He is a full-time student. D. He works at the university housing office.
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