单项选择题

The word "carbon"(I.ine 4, 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
As to the greenhouse effect, the author ______.
A．shares the same view with the scientists
B．is uncertain of its occurrence
C．rejects it as being ungrounded
D．thinks that it will destroy the world soon
单项选择题
What does the writer think about machines with human-like ability
A．He believes they will be useful to human beings.
B．He believes that they will control us in the future.
C．He is not quite sure in what way they may influence us.
D．He doesn't consider the construction of such machines possible.
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