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
During the two weeks on the beach, Tom showed more love to his wife because ______.
A．she looked lovely in her new clothes
B．he had made a lot of money in his Wall Street firm
C．he was determined to be a good husband
D．she was seriously ill
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