单项选择题

The sun heats the earth, （） is very important to the living things.

A．which
B．that
C．as
D．what

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热门试题

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.

单项选择题

The underlined word carbon Para. 2) stands for （）.

A．intelligent robots
B．a chemical element
C．an organic substance
D．human beings