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【单选题】
某商品的价格为2元／件时，销售量为300件；当价格提高到4元／件时，销售量为100件。按照点弹性公式计算，该商品的需求价格弹性是（ ）。A.
0．40
B.
0．67
C.
1．50
D.
2．00
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举一反三
【单选题】Which of the following statements about the Alzheimer's disease is NOT true?
A.
It was so named because Alois Alzheimer first described it.
B.
It is the greatest cause of mental deterioration in older people.
C.
It can gradually destroy memory and eventually cause death.
D.
There are many ways to deal with and cure the disease now.
【单选题】Which of the following is true about the U.S. Navy underwater listening network?.
A.
It is now partly accessible to civilian scientists.
B.
It has been replaced by a more advanced system.
C.
It became useless to the military after the cold war.
D.
It is indispensable in protecting endangered species.
【单选题】— Is _____ true that Americans eat hamburgers and hot dogs every day? — No, that's not true, but they are both very popular foods in America. [ ]
A.
this
B.
anything
C.
it
D.
something
【单选题】______some ads can be very useful. [ ]
A.
Its true
B.
That's true
C.
It's true that
D.
This is true
【单选题】It’s true that whoever ____positive for H7N9 will receive free medical treatment from our government without delay.
A.
is tested
B.
is being tested
C.
has tested
D.
tests
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