Question

9．[1]A flood is the overflow of a huge amount of water onto normally dry land．Flooding occurs when the overflowing water submerges （淹沒(méi)） land，and it causes a lot of problems．It is a cruel and violent expression of water．
[2]Floods are often deadly and damaging．They kill lots of people，damage houses and crops，and cause extensive destruction．In broader terms，floods are of two types：natural floods and catastrophic floods．Natural floods are the floods that are caused naturally by the overflow of a huge volume of water，from rivers，lakes，oceans，or by heavy rain or downpours，hurricanes，and so on．Catastrophic floods are floods that are caused by some significant （重大的） or unexpected events，for instance，dam breakages．
[3]Heavy rainfall is one of the major causes of floods．The level of water in rivers or lakes rises due to heavy rainfall．When the level of water rises above the river banks or dam，the water starts overflowing，which causes floods．Floods occur more in the regions that ____________．
[4]Floods are also caused due to heavy snow melting．Global temperatures are rising due to global warming．The rising temperatures are making the snow caps melt faster．Continuous and fast melting snow raises the level of water in the oceans，which consequently raises the level of water in rivers，and when the level of water in rivers rises above the river banks，it causes floods．
[5]Generally，floods occur more in low-lying areas or areas below sea level．One of the main reasons is that rivers flow slowly in these areas．′The volume of water increases in low-lying areas．When the level of water rises in these regions，it causes floods．
[6]Sometimes floods are caused due to poor dams that cannot hold great volume of water．Therefore，there are always different causes of floods．However，floods caused by humans can be avoided．Humans should let the nature go its own way．
76．What is the main idea of the passage？（no more than 5 words）
What causes floods．
77．When do floods occur？（no more than 6 words）
When the overflowing water submerges land．
78．What causes catastrophic floods？（no more than 8 words）
Some significant or unexpected events，like dam breakages．
79．Fill in the blank in Paragraph 3 wit proper words．（no more than 4 words ）
get heavy rainfall
80．What does the word"They"（Line 1，Paragraph 2）probably refer to？（1 word）
Floods．．

Answer 1

分析 洪水是大量的水流向平常干燥的地區(qū)．當(dāng)大量的水淹沒(méi)陸地時(shí)，就產(chǎn)生了洪水災(zāi)害．洪水通常是致命的、具有破壞性的．可以分為自然性和災(zāi)害性洪水．造成洪水的原因有很多．

解答 76 What causes floods．
77  When the overflowing water submerges land．
78  Some significant or unexpected events，like dam breakages．
79  get heavy rainfall
80  Floods．
76 What causes floods．主旨大意題．文章第一段介紹了洪水的概念；第二段講的是洪水的分類(lèi)，接下來(lái)幾段講的是洪水產(chǎn)生的原因．Heavy rainfall；heavy snow melting；low-lying areas or areas below sea level；poor dams等都是洪水產(chǎn)生的原因，文章主要講的是造成洪水災(zāi)害的原因，故填What causes floods．．
77  When the overflowing water submerges land．細(xì)節(jié)題．根據(jù)第一段"Flooding occurs when the overflowing water submerges （淹沒(méi)） land"可知，當(dāng)過(guò)多的水淹沒(méi)地面時(shí)，就會(huì)產(chǎn)生洪水災(zāi)害．故填When the overflowing water submerges land．．
78  Some significant or unexpected events，like dam breakages．細(xì)節(jié)題．：根據(jù)第二段"Catastrophic floods are floods that are caused by some significant （重大的） or unexpected events，for instance，dam breakages．"可知，災(zāi)害性洪水是由一些重大或突發(fā)事件引起的洪水．故填Some significant or unexpected events，like dam breakages．．
79  get heavy rainfall細(xì)節(jié)題．根據(jù)第三段"Heavy rainfall is one of the major causes of floods．"可知，本段講的是大雨，所填的與大雨有關(guān)，故填get heavy rainfall．
80  Floods．猜測(cè)詞義題．根據(jù)第二段"Floods are often deadly and damaging．"可知，代詞they指的是Floods．故填Floods．．

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