By the time he realizes he _____ into a trap, it'll be too late for him to do anything about it. [ ]

A. walks

B. walked

C. had walked

D. has walked

下列观点不属于达尔文进化理论的是（）

A．生物在代代相传的繁育过程中都有可能发生变异

B．变异的长期积累，导致各个物种出现千变万化

C．变异是长期存在、逐步发展，进化是逐渐发生的

D．生物进化不是“适者生存”，而是“幸者生存”