单项选择题

A number of predictions can be disproved by

A．observations
B．experiments
C．theories
D．hypotheses
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单项选择题
In American football players can ______.
A．only kick the ball
B．only throw the ball
C．only carry the ball
D．kick, throw and carry the ball
单项选择题
If a team wants to get points, it has to move the ball ______.
A．10 yards
B．40 yards
C．away from its own end
D．to the other end
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