25. The passage suggests that which of the following is
true of the structure of cycad cones？
（A） The structure of cycad cones provides conclusive
evidence in favor of one particular explanation
of cycad pollination.
（B） The structure of cycad cones provides evidence
concerning what triggers the first step in the
（C） An irresolvable discrepancy exists between what
the structure of most male cycad cones suggests
about cycad pollination and what the structure of
most female cones suggests about that process.
（D） The structure of male cycad cones rules out a
possible mechanism for cycad pollination that is
suggested by the structure of most female cycad
（E） The structure of male cycad cones is consistent
with a certain means of cycad pollination， but
that means is inconsistent with the structure of
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
（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'
（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