单项选择题

A．The cafeteria isn’’t open to guests.
B．They have to pay for at least seven meals.
C．They have to wait until all the students finish their meals.
D．They can buy their meals when they eat.
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单项选择题
According to the National Science Foundation, there are more than 26, 500 Chinese students studying in U.S.A universities.
A．Y
B．N
C．NG
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It can be inferred from the passage that, compared to conventional X-ray techniques, computed tomography is more _________.
A．compact
B．rapid
C．economical
D．informative
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