分页标题
2011-09-29 11:19:00   来源：作文地带    双击单词自动翻译

　　most female cycad cones.

　　26. The evidence in favor of insect pollination of cycads

　　presented in lines 2-4 would be more convincing if

　　which of the following were also true?

　　(A) Only a small variety of cycad species can be

　　successfully transplanted.

　　(B) Cycads can sometimes be pollinated by means

　　other than wind or insects.

　　(C) Insects indigenous to regions to which cycads are

　　transplanted sometimes feed on cycads.

　　(D) Winds in the areas to which cycads are usually

　　transplanted are similar to winds in cycads’

　　native habitats.

　　(E) The transplantation of cycads from one region to

　　another usually involves the accidental removal

　　and introduction of insects as well.

　　27. The passage suggests that which of the following is

　　true of scientific investigations of cycad pollination?

　　(A) They have not yet produced any systematic evi-

　　dence of wind pollination in cycads.

　　(B) They have so far confirmed anecdotal reports con-

　　cerning the wind pollination of cycads.

　　(C) They have, until recently, produced little evidence

　　in favor of insect pollination in cycads.

　　(D) They have primarily been carried out using cycads

　　transplanted from their native habitats.

　　(E) They have usually concentrated on describing the

　　physical characteristics of the cycad reproductive

　　system.