高中英语人教Unit 4 Adversity and Courage 作业.doc

UNIT 4　Adversity and Courage
A组·基础巩固
Ⅰ. 语法填空
A
Today we know Antarctica as an extreme environment 1. ________(contain) ice and snow. But new research provides evidence that the area was very different in the past, 2. ________ was found inside a piece of Earth sediment (沉淀物) gathered by researchers 3. ________ under the seafloor off the coast of Antarctica.
In the sediment, they 4. ________(find) forest soil estimated to be about 90 million years old and this would have been in the Cretaceous Period, when dinosaurs were the main land 5. ________(animal). Johann Klages, who was the lead writer of a study on the findings 6. ________(publish) in the journal Nature, said the sediment collection was from 7. ________ depth of about 30 metres below the ocean floor. Klages said an examination showed that the material formed on land, not in the ocean.
The research represents new evidence of the major climate changes Earth has experienced in the past — and is 8. ________(current) undergoing today. The researchers said that the rainforest environment in Antarctica was especially surprising because each year the area 9. ________(experience) a four­month polar night when there is no sunlight to fuel plant life. Klages said no ice sheets were present during the time, but 10. ________(season) snowfall was likely.
【语篇解读】本文是一篇说明文。研究人员从南极洲海岸附近的海底收集的一块泥土沉积物中发现：这些沉积物是在陆地上形成的，而不是在海洋中。
1. containing　考查非谓语动词。分析句子结构可知，句中已有谓语动词，此处应用非谓语动词。主语Antarctica和动词contain之间是主动关系，用现在分词形式作定语，故填containing。
2. which　考查定语从句。句中包含非限制性定语从句，先行词是evidence，在定语从句中作主语，只能用关系代词which引导，故填which。
3. from　考查介词。此处表示“从，来自”，故填from。
4. found　考查动词时态。此处讲述研究泥土沉积物的发现，是过去发生的事，与上下文时态一致，用一般过去时，故填found。
5. animals　考查名词的单复数。animal是可数名词，与主语dinosaurs和系动词were保持一致应用复数形式，故填animals。
6. published　考查过去分词。句中findings和动词publish之间是被动关系，应该用过去分词，表示这些发现被公布，故填published。
7. a　考查冠词。此处指收集的沉积物来自海床下大约30米的深度，a depth of ...“……的深度”。故填a。
8. currently　考查副词。修饰动词“undergoing”用副词，故填currently。
9. experiences　考查动词的时态和主谓一