单项选择题

In Paragraph 4, the author implies that imagination is most important to scientists when they ______.

A．evaluate previous work on a problem
B．formulate possible solutions to a problem
C．gather known facts
D．close an investigation
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单项选择题
What is NOT true about a theory
A．A useful theory can explain past observations.
B．A useful theory helps to make predictions.
C．A theory is the truth that does not need to be tested.
D．A theory may have to be revised or rejected some times.
单项选择题
The key point of the quotation from Jules Henry Pincare is that ______.
A．facts are the most important things
B．building a house is like performing experiments
C．science is more than a collection of facts
D．a pile of bricks can not be called a house
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