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
Science involves ______.
A．imagination and creative thinking
B．collecting information
C．performing experiments
D．all of the above
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.
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