Conservationist: The population of a certain wildflower is so small that the species is headed for extinction. However, this wildflower can cross-pollinate with a closely related domesticated daisy, producing viable seeds. Such cross-pollination could result in a significant population of wildflower-daisy hybrids. The daisy should therefore be introduced into the wildflower’s range, since although the hybrid would differ markedly from the wildflower, hybridization is the only means of preventing total loss of the wildflower in its range.
34. Which one of the following is an assumption on which the conservationist’s reasoning depends?
A. The wildflower currently reproduces only by forming seeds. B. The domesticated daisy was bred from wild plants that once grew in the wildflower’s range. C. Increasing the population of the wildflower will also expand its range. D. Wildflower-daisy hybrids will be able to reproduce. E. The domesticated daisy will cross-pollinate with any daisy like plant.
这里的B选项我没有明白具体是什么意思。我理解的是必须要在这个windflower生长的范围之类,不然的话怎么授粉呢?是这样理解吗?
[此贴子已经被作者于2007-7-29 16:00:10编辑过] |