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1.In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)16x is an integer.
(2)8x is an integer.
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.
2.Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long.Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure.The two trains passed each other after traveling for 2 hours.When the two trains passed, which train was nearer to its destination?
(1)At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2)Train Q averaged a speed of 55 miles per hour for the entire trip.
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.
这一题答案是A，我想知道为什么B不对呢？
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long.Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure.The two trains passed each other after traveling for 2 hours.When the two trains passed, which train was nearer to its destination?
(1)At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2)Train Q averaged a speed of 55 miles per hour for the entire trip.
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.
这一题答案是A，我想知道为什么B不对呢？ |
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发表于 2011-10-13 08:05:26
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