11.The massive 8.8quake,the seventh strongest in recorded history,hit Chile and should have shortened the length of an Earth day by 1.26milliseconds,More impressive is how much the quake shifted the Earth's axis(地軸).The computer mode!Used to determine the effects of the Chile earthquake effect also found that it should have moved the Earth's figure axis by about 8cm.The Earth's figure figure axis is not the same as its north-south axis,which Earth turns around once every day at a speed of about 1,604kph.The figure axis is the axis around which the Earth's mass is balanced.It is offset(偏離) from the Earth's north-south axis by about 10meters.
Strong earthquakes can change Earth's days and its axis.The 9.1Sumatran earthquake in 2004,which set off a deadly tsunami(海嘯),should have shortened Earth's days by 0.0068milliseconds and shifted its axis by about 7cm.
One Earth day is about 24hours long.Over the course of a year,the length of a day normally changes gradually by one millisecond,It increases in the winter when Earth more slowly,and decreases in the summer.
The Chile earthquake was much smaller than the Sumatran quake,but its effects on the Earth are larger because of its location.The fault(斷層) responsible for the 2010Chile quake also cuts through Earth at a larger angle that the Sumatran quake's fault.This makes the Chile fault ore effective in moving the Earth's mass vertically and hence more effective in shifting the Earth's figure axis.
The findings are based on early date available on the Chile earthquake.The Chile earthquake has killed more than 700people and cause widespread damage in the South American country.
64.What's the biggest problem caused by the Chile quake?C
A.It is the seventh strongest in recorded history.
B.It should have shortened the length of an Earth day.
C.It shifted the Earth's axis.
D.It made the day longer on Earth.
65.Comparing the Sumatram earthquake with the Chile earthquake,we know thatB.
A.the Sumatram earthquake had more effect on Earth
B.the location of the Chile earthquake is responsible for its larger effects on Earth.
C.the Sumatram earthquake was less destructive
D.the Chile earthquake fault changed the Earth's mass
66.What does the word"it"in the 4th paragraph refer to?A
A.The leng of a day. B.The axis.
C.One millisecond. D.The change of the day.
分析 本文是一篇科教類閱讀,主要講了發(fā)生在Chile的8.8級地震對地球所產(chǎn)生的各種影響及其原因.
解答 64-66.CBA
64題答案:C考查細節(jié)推理,根據(jù)原文第一段的More impressive is how much the quake shifted the Earth's axis(地軸)."更重要的是地震將地軸改變了多少"可知本題答案為C選項.
65題答案:B考查細節(jié)推理,根據(jù)原文倒數(shù)第二段的The Chile earthquake was much smaller than the Sumatran quake,but its effects on the Earth are larger because of its location.Chile地震比Sumatran地震要小得多,但是因其位置它對于地球的影響要大.可知本題答案為B選項.
66題答案:A考查細節(jié)推理,根據(jù)原文的Over the course of a year,the length of a day normally changes gradually by one millisecond,It increases in the winter when Earth more slowly,and decreases in the summer.在一年中,一天的長度通常是以一毫秒的增減逐漸改變,它在冬天(地球運轉慢)會增加夏天會減少.可知本句中的it指的是"the length of a day",故本題答案為A選項.
點評 本文是一篇科教類閱讀,題目涉及多道細節(jié)理解題,做題時結合原文和題目有針對 性找出相關語句進行仔細分析,結合選項選出正確答案.推理判斷也是要在抓住關鍵句子的基礎上合理的分析才能得出正確的答案.