【題目】閱讀下面材料,在空白處填入適當(dāng)?shù)膬?nèi)容或括號內(nèi)單詞的正確形式。

At last firefighters have put out a big forest fire in California.Since then,they 【1】 (set) about finding out2 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;纏繞)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 very8(usual).A bird had snatched up the snake from the ground and then9(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 考查動詞的時態(tài)。根據(jù)since then 自從那時起,用現(xiàn)在完成時;

【2】how 考查賓語從句。句意:自從那時起, 他們就開始研究火災(zāi)是如此著起來的;

【3】broken 考查形容詞。句意:森林火災(zāi)通常由碎玻璃或人們粗心扔的煙頭引起的。

【4】firemen 考查名詞。句意:昨天消防員們檢查了地面但什么也沒有發(fā)現(xiàn);

【5】before 考查連詞。句意:然而一個消防員偶然發(fā)現(xiàn)原因之前已經(jīng)過了數(shù)小時;

【6】the 考查冠詞 句意:用這種方法,他能發(fā)現(xiàn)這個秘密,表示特指;

【7】explanation 考查名詞 句意:解釋很簡單但又不同尋常;

【8】unusual 考查形容詞。句意:解釋很簡單但又不同尋常

【9】dropped 考查動詞的時態(tài)。And連接santched 與droped是并列的,故時態(tài)保持一致;

【10】itself 考查代詞。句意:蛇纏在電線上。

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