单选题：What does not belong to the studying method taken by scienti

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题目内容：
What does not belong to the studying method taken by scientists? A．They bury measuring device 3 kilometers under the volcano floo
B．They observe carefully the change of the mountain's positio
C．They also observe activities of the earth when it change
D．Devices are placed within 20 kilometers of Mount SHelen
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A．a stranger's less mature type of thinkingB．the most comple

A．a stranger's less mature type of thinkingB．the most complex areas of our corte

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As soon as Jennifer asked his name and address， the man rang

As soon as Jennifer asked his name and address， the man rang off．A．rang back B．r

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The main purpose of this meeting is to elect a new chairman．

The main purpose of this meeting is to elect a new chairman．A．dominant B．minor C

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