单项选择题

It seems that some young scientists ______.

A．have a keen interest in prediction
B．often speculate on the future
C．think highly of creative thinking
D．stick to "scientific method"
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单项选择题
The autor wants to prove with the example of Isaac Newton that ______.
A．inquiring minds are more important than scientific experiments
B．science advances when fruitful researches are conducted
C．scientists seldom forget the essential nature of research
D．unpredictability weighs less than prediction in scientific research
单项选择题
If someone holds a book 6 feet directly in front of Denis and then moves it only 1 foot directly in front of him, what change in sound does. Dennis hear
A．A lover-pitched sound.
B．A higher-pitched sound.
C．A sharper sound.
D．A softer sound.
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