2017届高考英语一轮复习必备单词素材：Unit 11 The Media（北师大版）_高考复习指南

　　4．What is the main cause of the trees in the Arctic moving northward?

　　A．The shrinking of northern tundra.

　　B．The rising temperature.

　　C．The fierce and cold wind.

　　D．The abundant resources in the north.

　　解析：选B　细节理解题。根据第二段的第二句“Across the Arctic, temperatures ...”以及本段的整体内容可知，不断上升的气温是北极圈树木北移的主要原因，即B项正确。

　　5．What does the underlined word “this” in Paragraph 2 mean?

　　A．To produce more seeds.

　　B．To move northward.

　　C．To respond to the climate change.

　　D．To protect themselves from the cold wind.

　　解析：选D　代词指代题。根据画线词前的“Trees growing along the tree line ... cold wind.”可知，画线词this 指代的是本句中的“protect themselves from the cold wind”，故D项正确。

　　6．What can be inferred from the last paragraph?

　　A．New trees can trap the snow, which may make the soil colder.

　　B．The trapped snow prevents new trees from producing more seeds.

　　C．New trees can make the surrounding air warmer.

　　D．New trees can bring more food and shelter to local animals.

　　解析：选C　推理判断题。根据最后一段中的“New trees will provide shelters for some snow ...This warms the surrounding air.”可推知，新树会让周围的空气更加温暖，故C项正确。

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