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【单选题】
标准曲线回归方程 表为 : y = bx + a 各子母表达的含义错误的是（ ）。 A ． b 为直线斜率 B ． a 为 y 轴上的截距，应为 0 C ． x 为被测溶液浓度 D ． y 为吸光度
A.
b为直线斜率
B.
a为y轴上的截距，应为0
C.
x为被测溶液浓度
D.
y为吸光度
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【单选题】I threw her a ________ but she missed it.
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warn
B.
word
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cue
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call
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【单选题】Which of the following statements best explains how the use of money in an economy increases economic efficiency?
A.
Money increases economic efficiency because it is costless to produce.
B.
Money increases economic efficiency because it discourages specialization.
C.
Money increases economic efficiency because it decreases transactions costs.
D.
Money cannot have an effect on economic efficiency.
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【单选题】_____frightened us ____the electricity was suddenly cut off, which threw all of us into the dark.
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【单选题】The supply of money increases when
A.
the value of money increases.
B.
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C.
the Fed makes open-market purchases.
D.
None of the above is correct.
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【单选题】The current demand for money increases when
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current real income increases.
B.
future real income decreases.
C.
the nominal rate of interest increases.
D.
none of the above.
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【单选题】She took off her boots and ______ on the floor near the door.
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fen
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【单选题】When the interest rate increases, the opportunity cost of holding money
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increases, so the quantity of money demanded increases.
B.
increases, so the quantity of money demanded decreases.
C.
decreases, so the quantity of money demanded increases.
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