Problem Solving
试题详情
题目：
选项:
A、A disturbance of salmonid spawning streams caused by human activity could increase the straying rate of affected salmonid populations as much as the aftermath of the Mount Saint Helens eruption did.
B、In the streams in which the straying salmonid spawn, these straying salmonid would amount to no more than 40 percent of the total spawning population.
C、Salmonid in some streams benefit from particular local adaptations.
D、Nonenvironmental factors have no effect on salmonid straying rates.
E、At least some of the streams in which straying salmonid would spawn are pristine, affected by neither natural nor artificial disturbances.
答案:
D
