单项选择题

The word "carbon" (Line 5, Para. 2) Stands for ______.

A．intelligent robots
B．a chemical element
C．an organic substance
D．human beings
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单项选择题
The word scrutiny'(Line 3,Para. 3)most probably means ______ .
A．inquiry
B．observation
C．control
D．suspicion
单项选择题
According to the passage, learning to read will no longer be a difficult task when ______.
A．children become highly motivated
B．teacher and learner roles are interchangeable
C．teaching helps children in the search for knowledge
D．reading enriches children's experience
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