lsat-26-2-10

10. All bridges built from 1950 to 1960 are in serious need of rehabilitation. Some bridges constructed in this period, however, were built according to faulty engineering design. That is the bad news. The good news is that at least some bridges in serous need of rehabilitation are not suspension bridges, since no suspension bridges are among the bridges that were built according to faulty engineering design.

If the statements above are true, then, on the basis of those statements, which one of the following must be true?

(A) Some suspension bridges are not in serious need of rehabilitation.

(B) Some suspension bridges are in serious need of rehabilitation.

(C) Some bridges that were built according to faulty engineering design are in serious need of rehabilitation.

(D) Some bridges built from 1950 to 1960 are not in serious need of rehabilitation.

(E) Some bridges that were built according to faulty engineering design are not bridges other than suspension bridges.

答案是c, 光看提干我已经晕了，哎，太久没学习脑袋都锈了！

谢谢lawyer，答案我也推出来了，我只是被这个stimulus搞晕了。

1950-1960年间建的所有桥都需要复原

这是年间建的桥中有些是依据不完善的工程设计。这是个坏消息。（为什么是坏消息？）

需要复原的桥中至少有一些不是吊桥。这是个好消息。因为设计错误的桥中没有吊桥。（这为什么又是个好消息呢？）