Duringonesummernotlongago,AmericansintheSouthwestwerewithoutrainformanydays.Thesunburnedupcrops.Animalswenthungryonthedryland.Atlast,cloudsappearedintheskyandsentdownrain.Howdosuchcloudsform?Thesun,theearth,andthe

Question

During one summer not longago,Americans in the Southwest were without rain for many days.The sun burnedup crops.Animals went hungry on the dry land.At last,clouds appeared in thesky and sent down rain.
How do suchclouds form?The sun,the earth,and the air all play a part.The changes thattake place before clouds can form do not always happen quickly.First,theearth is heated by the sun.This causes tiny drops of water in oceans andrivers to rise and mix with air.As the wet air rises higher,it cools off,making clouds.
Whatcauses these clouds to become rain?The tiny drops of water inside the cloudsbecome larger as they gather more wetness from the air around them.Finally,the drops become so large that they can no longer be held up by the air.Theyfall to the ground as rain.
Theraindrops that fall are not always the same size.Some may be very large.Butthe smallest come down in a fine mist.
Rain isneeded for all life.When it falls after a long dry spell,trees,grass,andbushes may begin to look fresh and green again.These plants need water to stayhealthy.The rain also causes streams to fill with water.This makes itpossible for fish and other animals to live.Rain brings new life and hope tomillions of people and other living things.
1.The first paragraph mentions the period of timeduring which the weather was very and crops were .
A.rainy,burnt B.drought,burntup
C.drought,burnt D.dry,burntup
2.Thephrase “play a part” means .
A.be a role B.form as a part
C.connect with each other D.make a contribution
3.Concerning how rain comes into being,which statement is true?
A.A lot of drops of water riseand mix with air as the sun shines.
B.Wet air cools off as it riseshigher.
C.The drops become larger andlarger as they gather more wetness.
D.The drops fall to the ground asthey become too large to hold up.
4.In thelast paragraph,the word “spell” means .
A.weather B.a period
C.times D.none of the above
5.Thispassage mainly explains ofclouds and rain.
A.the formation B.the phenomena
C.the importance D.the function

Answer 1

1、D
2、D
3、B
4、C
5、A