5.should    use   dangerous   habit    spend    much    safely   at   it   although
Overhead bridges are f ound in many parts of Lanzhou,especially in places where traffic is heavy and crossing the road is very (71)dangerous.
The purpose of these overhead bridges is to enable passengers to cross road (72)safely.Overhead bridges are used in very much the same way as zebra crossings.They are more efficient(73)although less convenient because people have to climb up a long flight of steps.This is inconvenient especially to old people.When passengers are (74)using a zebra crossing,traffic is held up.This is why the government has built many overhead bridges to help passengers and to keep traffic moving(75)at the same time.
The government  of Lanzhou has (76)spent lots of money in building these bridges.For their own safety,passengers (77)should be encouraged to use them instead of risking their lives by running across the road.Old people,however,may find (78)it a little difficult climbing up and down the steps,but it is still (79)much safer than walking across the road with all the dangerous of moving traffic.
Overhead bridges  serve a very useful purpose.Passengers,both old and young,should make a (80)habit to use them.This will prevent unnecessary accidents and loss of life.
11.It was a cold windy winter day and I was walking home from work.My head pointed downagainst the(31)CwhenI noticed an old lady.She was(32)Bon the sidewalk in her house slippers(拖鞋).
    As I(33)Dher,I saw that she was well into her 80s,and she was holding some(34)Ain her hands.
    I walked on and arrived at the traffic light.Waiting there,I saw the mailbox(35)Athe street.The light turned green,but Ipretended (假装)to check my phone and waited for her to catch upwithme.In this neighborhood,even crossing with the green light was(36)C.Drivers often drove(37)Cthrough red lights and stop signs.
    I stayed there until she(38)Bme.I turned to her and touched her gently on the arm.She smiled and took my hand in hers and(35)Dit.Her small hand was soft and warm.Hand-in-hand,we were waiting for the(40)Bto change.
    When the lightturned green,we walked togetherslowlyacross the street,(41)Cthe letters in the mailbox.Then Itook her(42)Bacross the street.
    As I walked therestof the way home,I could still feel the(43)Aof her hand in my own.
People say the first language of all humans is(44)C.A caring touch helps to make a bad situation(45)D.And even now,every time I think of the old lady,I can still feel thepowerof touch.
31.A.crowdB.snowC.windD.rain
32.A.beggingB.walkingC.runningD.riding
33.A.knewB.expectedC.missedD.passed
34.A.lettersB.picturesC.booksD.flowers
35.A.acrossB.overC.throughD.behind
36.A.strangeB.crazyC.dangerousD.safe
37.A.carefullyB.quietlyC.wildlyD.calmly
38.A.calledB.reachedC.foundD.caught
39.A.pushedB.pulledC.hitD.held
40.A.wayB.lightC.rideD.traffic
41.A.tookB.sentC.droppedD.locked
42.A.forwardB.backC.awayD.ahead
43.A.warmthB.trustC.careD.love
44.A.helpB.kindnessC.touchD.action
45.A.interestingB.necessaryC.popularD.hopeful
10.We call Earth our"mother planet".Have you thought of appreciating nature and learning to protect it like we love our mother?If you never have,then Earth Day is good timing.
April 22marks the 45th World Earth Day,a day for us to celebrate Earth.This year,the theme of the day is"It's our turn to lead".It aims to push global leaders to take action on climate change.
Climate change is an important and lasting change of climate.Global warming has become the worst problem about climate.It makes sea levels rise.If sea levels carry on rising,some places may disappear under water in just a few dozen years.It may also cause other problems,such as the extinction of certain kinds of animals.
Many believe that global warming is caused by human activities:car exhaust emissions(尾气),burning of coal by factories and cutting down of trees.
Can we do anything about it?Sure.Everybody can do a little bit to protect Mother Earth.Here are some suggestions:
Change bulbs.
People produce electricity by using natural resources.So it helps to turn off lights,the television,and the computer when you stop using them.You can also ask your parents to change the light bulbs in your home to compact fluorescent light bulbs(节能灯泡).
Bike or walk to school.
Do you go to school by bus or by bike?If you bike,you are doing something good for Earth.If you live near your school,you can simply walk to school to save energy.
Wash the green way.
Do you help wash clothes at home?Then wash them in an energy-saving way.Never start your washing machine unless it is full of clothes.Dry your clothes the natural way by hanging them on a line rather than putting them in a dryer.
 Passage outlineSupporting details
The 45th World Earth DayThe theme of the day is"It's our turn to lead".Its aim is to push global leaders to take action.Global warming is a problem (81)which is worse than any others about climate.
Problems of global warming•Sea levels (82)carry on rising.
•Certain kinds of animals become extinct.
(83)Reasons of global warming•Car exhaust emissions.
•Burning of coal by factories.
•Cutting down of trees.
Suggestions to protect Earth•Change the light bulbs in your home to compact fluorescent light ones.
•Bike or walk to school.
•Don't start your washing machine (84)unless it is not full.And let the clothes dry (85)by hanging them on a line.
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