题目内容
阅读下面的短文,在标有序号的空白处填入一个适当的词,或填入括号中动词的适当形式。
No one knows 1 how the earth began, as it happened so long ago.However, according to a widely 2 (accept)theory, the universe began with a “Big Bang” 3 threw matter in all directions. 4 several billion years afterwards, the earth was still just a cloud of dust.What it was to become was uncertain until between 4.5 and 3.8 billion years ago 5 the dust settled into a solid 6 .The earth became 7 violent that it was not clear whether the shape would last or not.It exploded loudly with fire and rock.They were 8 time to produce carbon, nitrogen, water vapor and other gases, which were 9 (make)the earth’s atmosphere.What is even more important is that as the earth cooled down, water began to appear on its 10 .
解析:
1.exactly 2.accepted 3.that/which 4.For 5.when 6.globe 7.so 8.in 9.to make 10.surface