题型：阅读理解 题类：常考题 难易度：普通
福建省莆田市第二十四中学2017-2018学年高二上学期英语期末考试试卷
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 dothis, 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.
White spruce, which is a 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 were warm enough. But in recent years, the whole planet has been warming.
New trees will provide shelters for some snow. Keeping the sun's rays from making the white surface disappear. Instead, the trees absorb the sun's heat. This warms the surrounding air. The extra warmth encourages even more trees to produce seeds. That further boosts a forest's 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 temperatures has helped more trees grow past the tree line. People worry about impacts on the animals that depend on frozen conditions for food and shelter.
A Language Programme for Teenagers
Welcome to Teenagers Abroad! We invite you to join us on an amazing journey of language learning.
Our Courses
Regardless of your choice of course, you'll develop your language ability both quickly and effectively.
Our Standard Course guarantees a significant increase in your confidence in a foreign language, with focused teaching in all 4 skill areas—speaking, listening, reading and writing.
Our Intensive Course builds on our Standard Course, with 10 additional lessons per week, guaranteeing the fastest possible language learning (see table below).
|
Course Type |
Days |
Number of Lessons |
Course Timetable |
|
Standard Course |
Mon－Fri |
20 lessons |
9:00—12:30 |
|
Intensive Course |
Mon－Fri |
20 lessons |
9:00—12:30 |
|
10 lessons |
13:00—14:30 |
Evaluation
Students are placed into classes according to their current language skills. The majority of them take an online language test before starting their programme. However, if this is not available, students sit the exam on the first Monday of their course.
Learning materials are provided to students throughout their course, and there will never be more than 15 participants in each class.
Arrivals and Transfer
Our programme offers the full package—students are taken good care of from the start through to the very end. They are collected from the airport upon arrival and brought to their accommodation in comfort. We require the student's full flight details at least 4 weeks in advance.
Meals/Allergies(过敏)/Special Dietary Requirements
Students are provided with breakfast, dinner and either a cooked or packed lunch (which consists of a sandwich, a drink and a dessert). Snacks outside of mealtimes may be purchased by the student individually.
We ask that you let us know of any allergies or dietary requirements as well as information about any medicines you take. Depending on the type of allergies and/or dietary requirements, an extra charge may be made for providing special food.
试题篮
