题目内容

[A] across
[B] about
[C] around
[D] by

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The Sherpas of Nepal is cited as an example to
[A] illustrate the advice of cultural companies.
[B] show the dilemma of backward tribes.
[C] compare different situations of tourism industry.
[D] recognize the benefits of tribes holding to their ideas.

The scientists' attitude towards the study published in the journal science is
[A] skeptical.
[B] enthusiastic.
[C] astonished.
[D] indifferent.

[A] evidence
[B] conception
[C] witness
[D] evaluation

The phrase "offering a ‘brief window of time' for humans to easily cross the sea"(5th paragraph) is closest in meaning to
[A] providing a panoramic view of the sea and an easier way to cross it
[B] Only a small window zone of the sea as little as 2.5 miles wide could be crossed.
[C] The descending supplied a temporary opportunity to cross the sea easily.
[D] The sea was as narrow as a window so that people could cross it without effort.