Question

【题目】阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

No one knows 【1】 (exact) how the earth began, as it happened so long ago. However, according to a widely 【2】 (accept) theory, the universe began 【3】 a “Big Bang” that threw matter in all 【4】 (direction). For several billion years after the “Big Bang”, the earth was still just a cloud of dust. 【5】 it was to become was 【6】 (certain) until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. The earth became so 【7】 (violence) that it was not clear 【8】 the shape would last or not. It exploded loudly with fire and rock. They were in time 【9】 (produce) carbon dioxide, nitrogen, water vapour and other gases, which were to make the earth’s atmosphere. What is even more important is that as the earth cooled down, water began to appear on 【10】 surface.

Answer 1

【答案】

【1】exactly

【2】accepted

【3】with

【4】directions

【5】What

【6】uncertain

【7】violent

【8】whether

【9】to produce

【10】its

【解析】

试题分析：文章讲述了地球最初形成时期的一些现象及逐渐变化的过程。

【1】exactly 考查副词。修饰动词know要用副词，此处指确切地知道，故填exactly。

【2】accepted 考查动词。此处指“广泛被接受的理论”，过去分词表被动作定语，故填accepted。

【3】with 考查介词。begin with“开始于”，是固定短语，故填with。

【4】directions 考查名词。此处指“物质向各个方向飞溅”，direction是可数名词用复数形式，故填directions。

【5】What 考查代词。指“地球要成为什么样子”， 此处用What引导主语从句，故填What。

【6】uncertain 考查形容词。句意：地球要成为什么样子是不确定的。形容词作表语，根据句意填uncertain。

【7】violent 考查形容词。此处作系动词became的表语用形容词，指地球变得如此猛烈，故填violent。

【8】whether 考查连词。与or not连用表示“是否”，指地球形状是否能维持。故填whether。

【9】to produce 考查不定式。用于系动词were后不定式作表语，指即将发生的事，故填to produce。

【10】its 考查代词。此处指地球的表面，是第三人称单数用its指代“地球的”，故填its。