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问题 选择题
已知
a
c2
＞
b
c2
，则下列不等式一定成立的是（　　）
A．a2＞b2B．lna＞lnbC．
1
b
＞
1
a
D．(
1
3
)b＞(
1
3
)a
答案

由题意，∵c2＞0，

a
c2
＞
b
c2
，

∴a＞b

若取a=1，b=-1，满足a＞b，但A，B，C均不成立．

∵函数y=(

1
3
)x为R上的减函数

∴(

1
3
)b＞(
1
3
)a，即D正确

故选D．

单项选择题

针对交割实物有异议的，异议由谁书面提交（）.

A.银行

B.代理会员

C.交易所工作人员

D.投资者本人
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单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

In the xy plane, is the point (4, -2) on the line l ？（）
(1) Point (1, 1) is on line l.
(2) The equation x=2-y describes line l.

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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