4.阅读下面短文,并根据题目要求用英语回答问题(请注意问题后的字数要求)
I'm not an athlete,but I am a lover of the Olympics.My biggest sports moment ever didn't  require me to be the fastest,the highest,or the strongest.It just required me to be in the right place at the right time,and catch the opportunity when it came to me.It was to carry our national flag for the Olympic Torch Relay.
  As a part of the celebration,flag bearers(旗手)were needed.I served in the army at that time and the Olympic organizers asked for volunteers to help carry some of the flags.Although it demanded that I give up part of my weekends and get up early,I thought that it was the chance of a lifetime.
  There were several different groups that took part in the event as flag bearers.We soldiers were going to be out in front leading them.On the day of the event,we arrived early at the Los Angeles Memorial Coliseum.Many people arrived to see the flame arrive from Greece,and the beginning of the Olympic Torch Relay.It was exciting to wait for our turn to enter the coliseum.
  As a flag bearer,I was supposed to run out in front.Though the flag was fairly heavy,I picked it up and ran with it.I ran past rows of people.I ran through television cameras.It was one of the most amazing experiences of my life,being able to carry our national flag in an international event like the Olympics.I was very proud of it.
  I had never been able to attend the Olympics,and I might never be important enough to carry an Olympic torch or anything like that,but I did get to carry our national flag in the torch relay,although I will no longer have the opportunity to carry the flag in the Olympics,and that would be one sports experience that would be difficult to forget.
76.What was the author when the Olympics were hosted in Los Angeles?(no more than 6 words)A soldier/The author was a soldier
77.What was the author asked to do as a volunteer?(no more than 10 words)To carry his/her national flag for the Olympic Torch Relay.
78.What's the meaning of the underlined sentence in Paragraph 2?(no more than 10 words)It was a rare/precious/worthwhile/valuable chance.
79.How many times has the author carried the flag in the Olympics?(no more than 2 words)Once/Only once.
80.Do you want to be a flag bearer?Why or why not?(no more than 20 words)Yes.Because it will be a good chance to participate in an event and experience the love for my motherland..
3.Styrofoam,or polystyrene,is a light-weight material,about 95 percent air,with very good  insulation(隔热) properties,according to Earthsource.org.It is used in products from cups that  keep your drinks hot or cold to packaging material that protects items during shipping.
    With the above good features,Styrofoam still enjoys a bad reputation.It cannot be recycled  without releasing dangerous pollution into the air.The U.S.Environmental Protection Agency says it is the fifth-largest creator of harmful waste.
    But now the common worms which are usually disgusting can come to the rescue,specifically,mealworms.Scientists from the U.S.and China have discovered that mealworms can digest plastic.One mealworm can digest a pill-sized amount of plastic a day.Study co-author Wei-Min Wu says that in 24 hours,the plastic is turned into carbon dioxide.
   Since Styrofoam has no nutrition at all,are the worms hurt by eating plastic?Much to the scientists'surprise,the study found that worms eating Styrofoam were as healthy as worms eating bran(谷糠).
    The researchers will study the worm's eating habits and digesting system,looking to copy the plastic breakdown but on a larger scale.Once the way can be put into practice,it will make a revolutionary difference to the disposal of plastic.
"Solving the issue of plastic pollution is important",says Wu,a Stanford University environmental engineering instructor.After all,our earth is small and landfill space is becoming limited with too much garbage waiting to be dealt with,he says.
    About 33-million tons of plastic are thrown away in the United States every year.Plastic plates,cups and containers take up 25 percent to 30 percent of space in America's landfills.One Styrofoam cup takes more than 1 million years to recycle in a landfill,according to Cleveland State University.

66.What do we know about Styrofoam?C
A.It can be used to cool drinks.
B.It is a weightless material.
C.It is harmful when recycled.
D.It is usually used on ships.
67.What can we infer from the third paragraph?A
A.Mealworms have amazing digesting power.
B.Mealworms are not bad in their nature.
C.Mealworms can rescue people's lives.
D.People misunderstood mealworms in the past.
68.Why will researchers study the worm's eating habits and digesting system?B
A.To find ways to help mealworms grow larger.
B.To imitate their ways of breaking down plastic.
C.To help develop their digesting ability.
D.To make sure of their safety after eating plastic.
69.In the future,plastic may be recycledD.
A.by raising amounts of mealworms    
B.by environmental engineering instructors
C.using a method inspired by eating mealworms 
D.without sending out dangerous pollution
70.What's the main idea of this passage?C
A.Styrofoam is widely used in daily life.
B.Mealworms are genius at eating plastic.
C.Plastic recycling may be no more a problem.
D.Plastic can be turned into carbon dioxide.
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