单项选择题

He couldn’t go up to Boston until very late due to

A．the trouble with the plane engine.
B．an accident on his way to the airport.
C．a hijacking incident.
D．the awful weather conditions.
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单项选择题
Max Mayfield, a top forecaster mentioned in the news report, works
A．in the National Hurricane Center.
B．as a CNN meteorologist.
C．somewhere near the Gulf of Mexico.
D．to predict the tropical storms.
单项选择题
According to the passage, why can’t any physical theory be permanently established
A．Such a theory is only suggested as a possible way of explaining an idea.
B．The person proposing such a theory may be incompetent.
C．Observations always disagree with predictions.
D．Observations are always falsified by predictions.
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