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本題由chris提供
The profit from the sale of a certain appliance increases,
(1) The profit exceeded $2 million on sales of 200,000 units.
(2) The profit exceeded $5 million on sales of 350,000 units.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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答案：
B
已知利潤(rùn)隨
著銷售單位增長(zhǎng)，但不是成比例增長(zhǎng)。問銷售單位380000時(shí)利潤(rùn)可否超過4百萬刀。
條件（1）銷售單位200000的時(shí)候利潤(rùn)超過2百萬刀，由于不是成比例增長(zhǎng)，不能確定利潤(rùn)和銷售單位之間準(zhǔn)確的函數(shù)表達(dá)式，不能確定在銷售單位380000時(shí)利潤(rùn)能否超過4百萬刀；
條件（2）銷售單位350000的時(shí)候利潤(rùn)超過5百萬刀，由于是可確定是遞增函數(shù)，380000大于350000，則銷售單位380000時(shí)利潤(rùn)超過5百萬刀，則可以確定一定超過4萬刀。Statement （2）Alone is sufficient，選擇B。 
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