Question

【題目】No one knows exact 【1】 the earth began, as it happened so long ago. 【2】 , according to a 【3】 (wide) accepted theory, the universe began with a “Big Bang” that threw matter 【4】 all directions. After that, atoms began to form and combine to create stars and other bodies.

Water 【5】 (appear) on other planets like Mars but, unlike the earth, it had disappeared later. 【6】 was not immediately obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued 【7】 (present) of water allowed the earth 【8】 (dissolve) harmful gases and acids into the oceans and seas. This produced 【9】 chain reaction, 【10】 made it possible for life to develop.

Answer 1

【答案】

【1】how

【2】However

【3】widely

【4】in

【5】 had appeared

【6】It

【7】 presence

【8】to dissolve

【9】 a

【10】which

【解析】

試題分析：文章講述了地球最初形成時期的一些現(xiàn)象及逐漸變化的過程。

【1】how 考查連詞。沒有人知道地球是如何開始形成的

【2】However 考查連詞。此處前后之間是轉(zhuǎn)折關(guān)系，故填However。

【3】widely 考查副詞。此處用副詞修飾動詞accept，故填widely。

【4】in 考查介詞。in all directions，四處; 四面八方，固定搭配。

【5】 had appeared 考查時態(tài)。根據(jù)后一句的時態(tài)可以確定此處為過去完成時，故填had appeared。

【6】It 考查代詞。此處為形式主語，后面that做真正的主語，故用it.

【7】 presence 考查名詞。此處意為水的存在，用名詞，填presence。

【8】to dissolve 考查非謂語動詞。此處為固定搭配，allow sb to do：允許某人做某事。

【9】 a 考查冠詞。此處是泛指，一種連鎖反應(yīng)，填a。

【10】which 考查引導(dǎo)詞。此處為非限制性定語從句，指代前面整個句子，做主語，故用which。