FF逻辑 16 求教啦~

emmawuxia

16. The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.

 

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

 

A.        If Mars had a sufficiently large nearby moon, Mars would be able to support life.

B.        If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life.

C.        Any planet with a stable, moderate axis tilt can support life.

D.       Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis.

E.        No planet that has more than one moon can support life.

请问A答案为什么不对呢？

正确答案是B

emmawuxia

稍微有了一点头绪。。。可是为什么是有倾斜才有月亮呢？文中的意思应该是有月亮所以才有倾斜吧。（1）有月亮，有倾斜。推出，没倾斜，没月亮。（2）没倾斜，没生命。所以决定一切的是倾斜度，而不是月亮。所以A错。

这样理解不知道对不对呢？