阅读36套中一道题

nancyelvUID: 3273541

One of the questions of interest in the study of the
evolution of spiders is whether the weaving of orb webs
evolved only once or several times. About half the
35,000 known kinds of spiders make webs; a third of the
web weavers make orb webs. Since most orb weavers
belong either to the Araneidae or the Uloboridae
families, the origin of the orb web can be determined
only by ascertaining whether the families are related.
Recent taxonomic analysis of individuals from both
families indicates that the families evolved from different
ancestors, thereby contradicting Wiehle‘s theory. This
theory postulates that the families must be related, based
on the assumption that complex behavior, such as web
building, could evolve only once. According to Kullman,
web structure is the only characteristic that suggests a
relationship between families. The families differ in
appearance, structure of body hair, and arrangement
of eyes. Only Uloborids lack venom glands. Further
identification and study of characteristic features will
undoubtedly answer the question of the evolution of
the orb web. (172 words)
8. The primary purpose of the passage is to
(A) settle the question of whether orb webs evolved
once or more than once
(B) describe scientific speculation concerning an
issue related to the evolution of orb webs
(C) analyze the differences between the character-
istic features of spiders in the Araneidae and
Uloboridae families
(D) question the methods used by earlier investiga-
tors of the habits of spiders
(E) demonstrate that Araneidae spiders are not
related to Uloboridae spiders
答案选B，个人觉得选A，求解啊！！！

wsjandzjjUID: 3002956

整篇文字只是推测，并未解决问题
“ Furtheridentification and study of characteristic features will undoubtedly answer the question of the evolution of the orb web.”
从最后一句话也能看出这个问题有待解决

nancyelvUID: 3273541

明白了，多谢！