We know from the passage that killer bees will spread to the United States （）

单项选择题The passage introduces to us （）

A．an old industrial center
B．a well-known university
C．a famous university town
D．a newly developed town

单项选择题This passage suggests that （）

A．John Winthrop had difficulty in sleeping
B．earthquakes are common in Boston
C．Boston was a center for clock-making
D．John Winthrop was a scientist