That large animals require a luxuriant vegetation, has been a general assumption which has passed from one work to another; b

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问题   That large animals require a luxuriant vegetation, has been a general
assumption which has passed from one work to another; but I do not
hesitate to say that it is completely true, and that it has  vitiated  the【S1】________
reasoning of geologists on some points of great interest in the ancient history
of the world. The prejudice has probably derived from India, and the Indian【S2】________
islands, which troops of elephants, noble forests, and impenetrable jungles, 【S3】________
are associated together in every one’s mind. If, therefore, we refer to any【S4】________
in almost every page either to the desert character of the country, nor to the【S6】________
numbers of large animals inhabiting it. The same thing is rendered evident
by the many engravings which have been published of various parts of the interior.
  Dr. Andrew Smith, who has lately succeeded in passing the Tropic of
Capricorn, informs me that, taken into consideration the whole of the【S7】________
southern part of Africa, there can be no doubt of its being a sterile country.
On the southern coasts there are some fine forests, but without these【S8】________
exceptions, the traveler may pass for days together through open plains,
covered by a poor and scanty vegetation. Now, if we look to the animals
inhabiting this wide plains, we shall  find their numbers  extraordinarily【S9】________
great, and their bulk immense. We must enumerate the elephant, three
species of rhinoceros, the giraffe, two zebras, two gnus, and several
antelopes even larger than these latter animals. It may be supposed that even【S10】________
although the species are numerous, the individuals of each kind are few.
【S4】

选项

答案therefore→however

解析 连接词错误。该句意为“但是,如果我们以非洲南部旅行游记为参考的话,我们就会发现几乎游记的每一页要么提到了这个地区的沙漠地貌,要么是柄息在那里的众多大型动物。”此句与前句有明显的转折语气,因此将therefore改为however。
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