1、.阅读理解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(冻土地带) starts h
2、as 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 dont have enough energy to make seeds.But as Earths climate has
3、 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 the white spruce(白云杉) grows.White spruce, which is a
4、North American tree, is quite able to produce a lot of seeds, which can move long distances in the wind.When windblown seeds end up on the tundra beyond the tree line, they eventually can sprout(发芽) new trees.This explains how a forest can move.Of course, the process would work only if the tundra we
5、re warm enough.But in recent years, the whole planet has been warming.New trees will provide shelters for some snow, keeping the suns rays from making the white surface disappear.Instead, the trees absorb the suns heat.This warms the surrounding air.The extra warmth encourages even more trees to pro
6、duce seeds.That further boosts a forests ability to expand.In addition, more trees will trap more snow, preventing much of it from being blown away.Snow can trap heat in the soil below, which encourages trees to grow.The recent rise of temperature has helped more trees grow past the tree line.People
7、 worry about impacts on the animals that depend on frozen conditions for food and shelter.本文是一篇报道，主要报道了由于气温升高，北极部分地区的森林正在向北移动的事件及原因。1What is the main cause of the trees in the Arctic moving northward?AThe shrinking of northern tundra.BThe rising temperature.CThe fierce and cold wind.DThe abundant re
8、sources in the north.答案：B解析：细节理解题。根据第二段第二、三句“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 (冻土地带) starts has been shifting northward.”可知，森林向北移动的原因是气温上升。故答案选B。2What does the under
9、lined word “this” in Paragraph 2 mean?ATo produce more seeds.BTo move northward.CTo respond to the climate change.DTo protect themselves from the cold wind.答案：D解析：代词指代题。根据第二段第四、五句“Trees growing along the tree line must protect themselves from the cold wind. To do this,_plants.”可知，此处的this指代前面的“protec
10、t themselves from the cold wind”，即树木保护自己免受冷风侵袭。故答案选D。3What can be inferred from the last paragraph?ANew trees can trap the snow, which may make the soil colder.BThe trapped snow prevents new trees from producing more seeds.CNew trees can make the surrounding air warmer.DNew trees can bring more food
11、 and shelter for local animals.答案：C解析：推理判断题。根据最后一段第二、三句“Instead, the trees absorb the suns heat. This warms the surrounding air.”可知，树能吸收太阳的热量，使周围的空气变得暖和。由此可知，新生长出来的树能够吸收更多的热量，使周围的空气更温暖。故答案选C。4The passage is most probably taken from _.Aa science reportBa health reportCa fashion magazine Da childrens
12、magazine答案：A解析：推理判断题。A项意为“科学报道”；B项意为“健康报道”；C项意为“时尚杂志”；D项意为“儿童杂志”。通读全文可知，本文主要介绍了由于气温升高，北极部分地区的森林正在向北移动的事件。由此可推知，本文应选自科学报道。故答案选A。.语法填空阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。Dear friends，Nice to see you again! Today I will tell you what to do if a fire _1_ (break) out. I know everyone learns about it, so we c
13、an protect _2_ (we) from the disaster.Remember _3_ (dial) 119 immediately in case of fire and try not to panic. Then choose a safe escape route as far _4_ the fire as possible. Meanwhile, cover your mouth and nose with a wet towel, bend over to help you _5_ (breath) as you move and leave quickly. If
14、 you cannot leave the building, try to find a room not _6_ (affect) by the fire and put wet towels over the windows and door to keep it free of smoke. _7_ there is a balcony, try to get there and shout for help from people _8_ are passing. If not, wait _9_ the firemen arrive. You only have had one _
15、10_ (live), so remember to take care of it at all times.Thats all. Thank you!1breaks解析：考查动词。根据句意可知，此处指发生火灾。break out意为“(战争、疾病，灾难等)爆发”；因为是if引导的条件状语从句，主句为一般将来时，从句应用一般现在时。故填breaks。2ourselves解析：考查反身代词。根据句意可知，此处强调谓语动作又回到主语本身，应用反身代词；本句主语是we，故用ourselves。3to_dial解析：考查非谓语动词。remember to do意为“记得去做”，符合语境。故填to d
16、ial。remember doing意为“记得做过”，用在此处不合题意。4from解析：考查介词。根据常识可知，失火时，应选择一条远离火的安全逃生路线。far from是固定短语，意为“远离”，符合语境。故填from。5(to)_breathe解析：考查非谓语动词。help sb. (to) do意为“帮助某人做”，是固定用法；breath为名词，此处应用它的动词形式。故填(to) breathe。6affected解析：考查非谓语动词。分析句子结构可知，affect在句中作后置定语修饰“room”，二者之间是被动关系，故填affected。7If解析：考查条件状语从句。句意：如果有阳台，试着走到那儿并叫喊向路人求助。这是假设情况。故填If。8who/that解析：考查定语从句。本句话是一个定语从句，先行词“people”在从句中作主语，故填who/that。9until解析：考查时间状语从句。根据句意可知，此处指“一直等到消防员到来”。故填until。10life解析：考查名词。本文介绍了在火灾中应如何逃生，由此可知，此处指生命只有一次。故填life。
