单项选择题

A．Importance of knowledge.
B．Differences between knowledge and practice.
C．How to gain experience.
D．Book knowledge and practical experience.
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单项选择题
A．It has several scratches in it.B．It can’t be opened in a normal way.C．The door handle is missing.D．It can’t be opened at all.
A．It has several scratches in it.
B．It can’t be opened in a normal way.
C．The door handle is missing.
D．It can’t be opened at all.
单项选择题
A．To determine whether the Earth’s temperature is going up.B．To study the behavior of some sea animals.C．To measure the depths of the ocean.D．To measure the movement of the ocean.
A．To determine whether the Earth’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depths of the ocean.
D．To measure the movement of the ocean.
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