单项选择题

What does "ice firs" mean in the conversation

A．The ice islands shatter into icebergs that float out to sea.
B．The ice islands are too cold for scientists to do any researcg.
C．The ice islands are estroyed by people.
D．The ice islands are becoming smaller.
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How many kinds of devices are mentioned in the passage which can measure time
A．3.
B．4.
C．5.
D．6.
单项选择题
How did he succeed according to himself.
A．By helping others.
B．By being approachable and caring.
C．By being persistent and not satisfied with just coming to work.
D．By having great ambitions.
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