In parts of the Arctic, entire forests are moving northward. Across the Arctic, temperatures are rising faster than anywhere else in the world. As that happens, the tree line that marks where forests stop and the treeless tundra (冻原) starts has been shifting northward. Trees growing along the tree line must protect themselves from the cold wind. To do this,_plants tend to grow

　　horizontal (水平的) branches

　　low

　　to

　　the

　　ground. The energy it takes for trees to grow this way means they don't have enough energy to make seeds.

　　QWhat 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.

　　答案：D　指代判断题。根据画线词前的“Trees growing along the tree line must protect themselves from the cold wind.”可知，画线词this指代的是本句中的“protect themselves from the cold wind”，即D项正确。

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