划分狭义货币与广义货币的一般性标准，是金融工具能否作为直接购买力。()
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What does the last paragraph suggest？
A. It is not likely that new energy resources will be adopted.
B. More tax will be levied on oil products.
C. People will become less dependent on oil.
D. People will buy cleaner new cars.
张居正改革的着重点是()。
A. 整顿赋役制度
B. 清查全国土地
C. 整顿边防
D. 加强君主专制统治
Male's heart power to pump blood around the body could have decreased by ______of its youthful strength.
A. 1/2
B. 2010-1-3
C. 2010-1-4
D. 2010-1-5
设随机变量X服从正态分布N(μ，σ2)，则随着σ的增大，概率P｛｜ x－μ｜＜σ｝()．
A. 单调增大
B. 单调减小
C. 保持不变
D. 增减不定
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