At last firemen have put out a big forest fire in California.Since then,they (1)have been tryinghave been trying(try) to find out how the fire(2)beganbegan(begin).Forest fires (3)areare(be) often caused by broken glass or by cigarette ends which people carelessly(4)throwthrow(throw) away.Yesterday the firemen(5)examinedexamined(examine) the ground carefully,but(6)werewere(be) not able to find any broken glass.They were also quite sure that a cigarette end did not start the fire.This morning,however,a firemen accidentally(7)discovereddiscovered(discover) the cause.He(8)noticednoticed(notice)the remains of a snake which was wound round the electric wires of a 16,000-volt power ljye.aie.In this way,he was able to solve the mystery.The explanation was simple but very unusual.A bird(9)had caughthad caught(catch) the snake from the ground and then (10)droppeddropped(drop) it on to the wires.The snake then wound itself round the wires.When it did so,it sent sparks down to the ground and these immediately started a fire.
【考點(diǎn)】人與自我.
【答案】have been trying;began;are;throw;examined;were;discovered;noticed;had caught;dropped
【解答】
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發(fā)布:2024/5/27 14:0:0組卷:10引用:1難度:0.5
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