四級(jí)考試閱讀備考筆記參考

　　Causes are classified as necessary, sufficient, or contributory(起輔助作用的). A necessary cause is one which must be present for the effect to occur, as combustion ，is necessary to drive a gasoline engine. A sufficient cause is one which can produce an effect unaided , though there may be more than one sufficient cause: a dead battery is enough to keep a car from starting, but faulty spark plugs(火花塞)or an empty gas tank will have the same effect. A contributory cause is one which helps to produce an effect but cannot do so by itself, as running through a red light may help cause an accident, though other factors --- pedestrians or other cars in the intersection-must also be present.

　　4. Your refrigerator is not working and you have found that the electric power has been cut off.

　　The power failure is a ____.

　　A) necessary cause B) sufficient cause

　　C) contributory cause D) none of them

　　注：斷電不是冰箱不工作的必要原因，而是原因之一，冰箱壞了也可以導(dǎo)致冰箱不工作。

　　Causes are classified as necessary, sufficient, or contributory(起輔助作用的). A necessary cause is one which must be present for the effect to occur, as combustion ，is necessary to drive a gasoline engine. A sufficient cause is one which can produce an effect unaided , though there may be more than one sufficient cause: a dead battery is enough to keep a car from starting, but faulty spark plugs(火花塞)or an empty gas tank will have the same effect. A contributory cause is one which helps to produce an effect but cannot do so by itself, as running through a red light may help cause an accident, though other factors --- pedestrians or other cars in the intersection-must also be present.

【四級(jí)考試閱讀備考筆記參考】相關(guān)文章：

雅思閱讀考試備考方法07-04

四級(jí)考試閱讀題型07-04

雅思閱讀考試備戰(zhàn)經(jīng)典筆記07-04

英語(yǔ)四級(jí)考試寫(xiě)作參考范文07-04

托業(yè)中有什么閱讀考試及備考方法07-04

英語(yǔ)四級(jí)考試寫(xiě)作題專(zhuān)項(xiàng)訓(xùn)練及參考范文07-04

英語(yǔ)四級(jí)考試備考作文Protecting the Intangible Cultural Heritages訓(xùn)練題07-04

雅思口語(yǔ)考試備考誤區(qū)07-04

四級(jí)考試寫(xiě)作點(diǎn)評(píng)07-04

四級(jí)考試寫(xiě)作范文07-04