单项选择题

In Paragraph 5, the author refers to a hypothesis as "a leap into the unknown" in order to show that hypotheses ______.

A．go beyond available facts
B．are sometimes ill-conceived
C．can lead to dangerous results
D．require efforts to formulate
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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
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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