菜鸟请教大家几道Prep题

fy_w

    

214.
            20776-!-item-!-187;#058&013419

    

Is the measure of
one of the interior angles of quadrilateral ABCD equal to 60 degrees?

    

 (1)  Two of the interior angles of ABCD are right
angles.

    

 2)  The degree measure of angle ABC is twice the
degree measure of angle BCD.

请教大家，B为什么不对呢？

    

202.
            19378-!-item-!-187;#058&012570

    

The numbers x and y
are not integers.  The value of x is
closest to which integer?

    

 (1)  4 is the integer that is closest to x + y.

    

 (2)  1 is the integer that is closest to x - y.

这道题怎么做呢？

    

200.
            19224-!-item-!-187;#058&012506

    

If d is a positive
integer and f is the product of the first 30 positive integers, what is the
value of d ?

    

 (1) 10^d is a
factor of f.

    

 (2)
d > 6

这道题有什么好办法吗？好麻烦的。

    

199.
            19170-!-item-!-187;#058&012498

    

Warehouse W's
revenue from the sale of sofas was what percent greater this year than it was
last year?

    

 (1)  Warehouse W sold 10 percent more sofas this
year than it did last year.

    

 (2)  Warehouse W's selling price per sofa was $30
greater this year than it was last year.

A为什么不对呢？

G0606

214.
   20776-!-item-!-187;#058&013419

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

 (1)  Two of the interior angles of ABCD are right angles.

 2)  The degree measure of angle ABC is twice the degree measure of angle BCD.

条件2不能单独成立：四边形ABCD 内角和360度，只说邻角之间的比例不足以判定有没有60度的内角。

c

202.
    19378-!-item-!-187;#058&012570

The numbers x and y are not integers.  The value of x is closest to which integer?

 (1)  4 is the integer that is closest to x + y.

 (2)  1 is the integer that is closest to x - y.

选E

                  x+y=                     x-y=                       x  =                   y=

                  3.6                        1.4                        2.5                     1.1

                  3.6                        0.6                        2.1                      1.5

                  4.4                        0.6                        2.5                      1.9

                  4.4                        1.4                        2.9                      1.5

x可接近2，可接近3

200.
    19224-!-item-!-187;#058&012506

If d is a positive integer and f is the product of the first 30 positive integers, what is the value of d ?

 (1) 10^d is a factor of f.

 (2) d > 6

c

30！中只有一个5^7作为其因子（30！=…5*…10*…15*…20*…25*…30…）

条件2成立时，d > 6，而条件1  10^7= 2^7  *  5^7

所以d只能是7

199.
    19170-!-item-!-187;#058&012498

Warehouse W's revenue from the sale of sofas was what percent greater this year than it was last year?

 (1)  Warehouse W sold 10 percent more sofas this year than it did last year.

 (2)  Warehouse W's selling price per sofa was $30 greater this year than it was last year.

题目问的是年收入增长比率，而条件1只给了销售数量增加比例

选E      

[此贴子已经被作者于2007-5-30 7:13:29编辑过]

fy_w

Thanks.

梦里柔荑

G0606 发表于 2007-5-30 07:13
214.   20776-!-item-!-187;#058&013419Is the measure of one of the interior angles of  ...

那为什么不选C呢