单项选择题

Newton's theory of gravity was corrected by Einstein's theory because of ______.

A．a new hypothesis about gravity
B．careful measurements of Mercury's motion
C．new practical considerations of Newton's theory
D．newly predicted observations

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单项选择题

A number of predictions can be disproved by

A．observations
B．experiments
C．theories
D．hypotheses

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