单项选择题

A．An essay examination.
B．An objective examination.
C．An open-book examination.
D．A take-home examination.
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单项选择题
A．She was seriously injured.B．She survived the accident.C．She lost consciousness.D．She fell into a stream.
A．She was seriously injured.
B．She survived the accident.
C．She lost consciousness.
D．She fell into a stream.
单项选择题
A．4.2 billion years ago.B．3.3 billion years ago.C．2.9 billion years ago.D．1.2 billion years ago.
A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
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