题目内容
【题目】阅读下面材料,在空白处填入适当的内容或括号内单词的正确形式。
At last firefighters have put out a big forest fire in California.Since then,they 【1】 (set) about finding out 【2】 the fire began.Forest fires are often caused by 【3】 (break)glass or by cigarette ends which people carelessly throw away.Yesterday the 【4】 (fireman)examined the ground but were not able to find any.They were also quite sure that a cigarette end didn’t start the fire.However,several hours passed 【5】 a fireman accidentally discovered the cause.He noticed the remains of a snake which was wound(蜿蜒;缠绕)around the electric wires of a 16,000-volt power line.In this way,he was able to solve 【6】 mystery.The 【7】 (explain) was simple but very 【8】 (usual).A bird had snatched up the snake from the ground and then 【9】 (drop)it on to the wires.The snake then wound 【10】 round the wires.When it did so,it sent sparks down to the ground and these immediately started a fire.
【答案】
【1】have set
【2】how
【3】broken
【4】firemen
【5】before
【6】the
【7】explanation
【8】unusual
【9】dropped
【10】itself
【解析】
【1】have set 考查动词的时态。根据since then 自从那时起,用现在完成时;
【2】how 考查宾语从句。句意:自从那时起, 他们就开始研究火灾是如此着起来的;
【3】broken 考查形容词。句意:森林火灾通常由碎玻璃或人们粗心扔的烟头引起的。
【4】firemen 考查名词。句意:昨天消防员们检查了地面但什么也没有发现;
【5】before 考查连词。句意:然而一个消防员偶然发现原因之前已经过了数小时;
【6】the 考查冠词 句意:用这种方法,他能发现这个秘密,表示特指;
【7】explanation 考查名词 句意:解释很简单但又不同寻常;
【8】unusual 考查形容词。句意:解释很简单但又不同寻常
【9】dropped 考查动词的时态。And连接santched 与droped是并列的,故时态保持一致;
【10】itself 考查代词。句意:蛇缠在电线上。