单项选择题

"...Old is suddenly in" ( Para. 1 ) most probably means" ______."

A．America has suddenly become a nation of old people
B．gerontology has suddenly become popular
C．more elderly professors are found on American campuses
D．American colleges have realized the need of enrolling older students
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单项选择题
Soap operas have helped in lowering Brazil's birth rate because ______.
A．they keep people sitting long hours watching TV
B．they have gradually changed people's way of life
C．people are drawn to their attractive package
D．they popularize birth control measures
单项选择题
How can a urine test show a patient may have a vitamin deficiency
A．A lot of vitamins are in the urine.
B．The body refuses to absorb vitamins.
C．Only a few vitamins passes through the body.
D．A lot of vitamins are taken in by the body.
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