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
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.

单选题

Is xyz=1?
　 (1) x (y²) =1
　 (2) 5z=0

A、
A
B、
B
C、
C
D、
D
E、
E

【正确答案】 B

【答案解析】

条件1不能确定z的值，故不能确定xyz是否等于1；若5z=0，则xyz=0，即xyz不等于1，故本题选B项。

单选题

Is rs=rx-2?
　 (1) r is an odd number
　 (2) x=s+2

A、
A
B、
B
C、
C
D、
D
E、
E

【正确答案】 E

【答案解析】

条件1不能确定r,s,x的值；条件2不能确定r的值；由x=s+2可以推知，s-x=2，但r(s-x)=2的前提条件是r=1，而条件1不能确定r是否为1，故将两个条件结合也无法得到rs=rx-2，故本题选E项。

单选题

What is the number of male employees at the factory?
　 (1) If the factorv were to hire 150 more employees and 2／3of them were female, the ratio of male to female employees would be 8: 3.
　 (2) The factory has at least twice as many male employees as female employees, and it employs at least 150 females.

A、
A
B、
B
C、
C
D、
D
E、
E

【正确答案】 E

【答案解析】

分别用两个条件计算，可以发现无法计算出男员工的数量；将两个条件相结合也无法计算出男员工的数量，故本题应选E项。

单选题

A、
A
B、
B
C、
C
D、
D
E、
E

【正确答案】 D

【答案解析】

通过条件1、2均可以知道xy间的距离为24英尺，故本题选D项。