单选题 Chronic back pain is usually caused by a herniated or degenerated spinal disk. In most cases the disk will have been damaged years before chronic pain develops, and in fact an estimated one in five people over the age of 30 has a herniated or degenerated disk that shows no chronic symptoms. If chronic pain later develops in such a case, it is generally brought about by a deterioration of the abdominal and spinal muscles caused by insufficient exercise.
The statements above, if true, most strongly support which one of the following?

A、 Four out of five people over the age of 30 can be sure they will never develop chronic back pain.
B、 People who exercise their abdominal and spinal muscles regularly are sure to be free from chronic back pain.
C、 Patients rarely suffer even mild and fleeting back pain at the time that a spinal disk first becomes herniated or degenerated.
D、 Doctors can accurately predict which people who do not have chronic back pain will develop it in the future.
E、 (E) There is a strategy that can be effective in delaying or preventing the onset of pain from a currently asymptomatic herniated or degenerated spinal disk.

【正确答案】 E

【答案解析】[解析] 由短文的最后一句话可知，缺乏锻炼是引起慢性疼痛的主要原因，也即经常锻炼就可以有效地防止慢性疼痛，因此(E)是正确答案；(B)过于绝对化，因为在某些特殊情况下，慢性疼痛可能不是由缺乏锻炼引起，所以经常锻炼不一定能消除慢性疼痛；(A)、(C)和(D)都不能从短文中合理地推出。