20．【答案】A

　　【解析】句意为：我们也需要重新思考我们的消费观。根据下文的“… and changing our spending habits”可知，A项符合语境，spend意为“花钱；消费”。

　　Ⅱ.阅读理解

　　(2017全国课标，D)

　　As more and more people speak the global languages of English, Chinese, Spanish, and Arabic, other languages are rapidly disappearing.In fact, half of the 6,000—7,000 languages spoken around the world today will likely die out by the next century, according to the United Nations Educational, Scientific, and Cultural Organization (UNESCO)．

　　In an effort to prevent language loss, scholars from a number of organizations—UNESCO and National Geographic among them—have for many years been documenting dying languages and the cultures they reflect.

　　Mark Turin, a scientist at the Macmillan Center, Yale University, who specializes in the languages and oral traditions of the Himalayas, is following in that_tradition.His recently published book, A Grammar of Thangmi with an Ethnolinguistic Introduction to the Speakers and Their Culture, grows out of his experience of living, working, and raising a family in a village in Nepal.

　　Documenting the Thangmi language and culture is just a starting point for Turin, who seeks to include other languages and oral traditions across the Himalayan reaches of India, Nepal, Bhutan, and China.But he is not content to simply record these voices before they disappear.

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