题目内容

【题目】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。

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 meters below the ocean floor. Klages said an examination showed that the material formed on land, not in the ocean.

The 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 four-month 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.

【答案】

【1】containing

【2】which

【3】from

【4】found

【5】animals

【6】published

【7】a

【8】currently

【9】experiences

【10】seasonal

【解析】

本文是说明文。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】

考查非谓语动词。分析句子结构可知，句中已有谓语动词，此处用非谓语。主语Antarctica和动词contain是主动关系，用现在分词形式作定语，故填containing。

【2】

考查定语从句。句中包含非限制性定语从句，先行词是evidence，在定语从句中做主语，只能用关系代词which引导，故填which。

【3】

考查介词。句意：但新的研究提供了证据，证明这片区域与过去大不相同，它是在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的。表示“从，来自”，故填from。

【4】

考查动词时态。此处讲述通过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】

考查名词复数。animal是单数可数名词，与主语和系动词dinosaurs were一致用复数，故填animals。

【6】

考查过去分词。句中findings和动词publish是被动关系应该用过去分词，指这些发现被出版，故填published。

【7】

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】

考查副词。修饰动词undergoing用副词，故填currently。

【9】

考查动词时态和主谓一致。根据句中时间状语each year可知用一般现在时，主语the area表示单数意义，谓语动词与之一致用第三人称单数，故填experiences。

【10】

考查形容词。此处表示季节性降雪，修饰名词snowfall用形容词，故填seasonal。

分析定语从句关键抓住两点：第一、找准先行词；第二、看先行词在定语从句中所作的成分。先行词往往为名词或代词，如小题2中包含非限制性定语从句，先行词是evidence，在定语从句中做主语，只能用关系代词which引导。

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