单项选择题

Steven's ability to learn from observations and experience ___________ greatly to his success in public life.

A．related
B．attached
C．attributed
D．contributed
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单项选择题
It can be inferred from this passage that the new system ___________.
A．has been put into practical use
B．is still on the planning table
C．is still in the experimental stage
D．needs to be improved
单项选择题
One of the technological problems that will have to be solved in developing the new system is ___________.
A．how to make enough ice underground
B．how to install the whole device underground
C．how to design the proper heat exchanger pipes for the system
D．how to make the tank so as to keep the temperature
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