8.Which of the following is the best title of this passage?
A.Why can't tourists go to Antarctica?
B.How can tourists go to Antarctica?
C.Should tourists go to Antarctica?
D.Are tourists allowed to go to Antarctica?
解析:选C 标题归纳题。通读全文的内容可知,文章围绕的是“应该不应该去南极洲旅游?”这一话题,因此C项最适合作标题。
C
(2016·甘肃省高三第一次诊断)Even if trees cannot walk, they are still on the move.
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.
But as Earth's climate has been warming, trees no longer have to just grow horizontally. Many can instead grow up toward the sky. This takes less energy. And with all that leftover energy, these trees have started producing more seeds. This happens especially in places where white spruce (白云杉) grows.
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