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It’s summertime-time once again for mosquitoes to make their appearance. And once they appear, mosquitoes are a total pain. They land on you,  bite you, suck out some blood and leave behind an itchy welt（发痒的红肿）.

  1  Female mosquitoes must find blood in order to reproduce, so mosquitoes come equipped with finely tuned sensors to help them locate the blood they need.

Mosquitoes’ weapons

Mosquitoes have perfected three different types of sensors. First, mosquitoes can sense several different chemicals. Mosquitoes can smell carbon dioxide and lactic acid（乳酸）up to 100 feet away.   2 

Second, mosquitoes have very good eyesight. If you are wearing clothing that contrasts with the background, and if you move while wearing that clothing, mosquitoes can see you. It’s a good bet that anything moving is alive, and therefore full of blood.

Finally, mosquitoes come equipped with temperature sensors, so they can find warm-blood mammals and birds very easily.

  3  The female mosquito sticks her proboscis（喙）into you. She sucks about five microliters of your blood into her abdomen.

After she has bitten you, some saliva（唾液）remains in the wound.   4  The area swells and you tich. Eventually, the selling goes away, but the itch remains until your immune cells break down the saliva proteins.

Our defense methods

Because mosquitoes are both a nuisance（讨厌的东西） and a danger, people prefer to stay away from mosquitoes. One way to do that is to use a chemical called DEET, which seems to black a mosquito’s chemical sensors.   5  In some cities there are even trucks that drive around town to spray for mosquitoes. Finally there are to traps. The most popular traps turn propane（丙烷） into carbon dioxide and warmth to attract mosquitoes. Over time, by catching large numbers of mosquitoes, these traps can cause the collapse of the mosquito population in the area.

A．Another way to control mosquitoes is with insecticides（杀虫剂） that kill them.

B．How mosquitoes work is unknown to most of us.

C．Once a mosquito lands on you, it is time to bite.

D．Some bites of mosquitoes are more serious than you thought.

E. Mammals and birds give off these gases as part of their normal breathing.

F. The proteins from the saliva create an immune response from your body.

G. But if you ignore the fact that mosquitoes are so annoying they really are amazing.

Getting away for a short time always seems like a great idea—until you have to pack. 1.The rule is: pack light. Here are some tips to help you pack.

1. Make a list. Think of what you need from your head to your toes. 2.When you’ve done this once, it’ll be easier next time.

2. Consider buying small-size samples of shampoo, toothpaste, and other items at your local drugstore. You can reuse the plastic containers next time you go away too.

3. Choosing which clothes to bring is probably the hardest packing decision to make. Think once again from head to toe — hat, shirts, jeans, sneakers, etc. Once you’ve picked out what you want to bring, think carefully. Do you really need that extra pair of jeans? If so, fine.3.Don’t try to fool yourself. You are the one who will be left holding the bag.

4. Weather is an important factor in your packing. If it’s cold, you could wear a jacket, a - sweater, a regular shirt, and a T-shirt. Putting them on will keep you warm. 4.Remember how much easier it will be to carry your bag! As for shoes, you may want to call ahead to see if dress shoes are necessary. If so, one pair will be enough, along with one pair of comfortable shoes.

Remember that it is you who have been invited somewhere, not your things.5.So, do it right—pack light.

A. Mixing and matching is a smart and easy way to lighten your load.

B. But packing won’t be a problem if you remember one simple rule.

C. You will have an easier time if you’re weighed down.

D. But make sure they’re really worth the extra weight.

E. It’s best to bring these things with you.

F. And it’ll leave more room in your bag.

G. Keep the list for future reference.

It was Monday. Mrs. Smith’s dog was hungry, but there was not any meat in the house. Considering that there was no better way, Mrs. Smith took a piece of paper, and wrote the following words on it “Give my dog half a pound of meat.” Then she gave the paper to her dog and said gently, “Take this to the butcher（屠夫）, and he’s going to give you your lunch today.” Holding the piece of paper in its mouth, the dog ran to the butcher’s. It gave the paper to the butcher. The butcher read it carefully, recognized that it was really the lady’s handwriting and soon did it as he was asked to. The dog was very happy, and ate the meat up at once. At noon, the dog came to the shop again. It gave the butcher a piece of paper again. After reading it, he gave it half a pound of meat once more. The next day, the dog came again exactly at noon. And as usual, it brought a piece of paper in the mouth. This time, the butcher did not take a look at paper, and gave the dog its meat, for he had regarded the dog as one of his customers(顾客). But, the dog came again at four o’clock. And the same thing happened once again. To the butcher’s more surprise, it came for the third time at six o’clock, and brought with it a third piece of paper. The butcher felt a bit puzzled. He said to himself, “This is a small dog. Why does Mrs. Smith give it so much meat to eat today?”

Looking at the piece of paper, he found that there were not any words on it!

1.The little dog went to the butcher’s ________ altogether during the two days.

2.The butcher did not give any meat to the dog __________.

A. before he felt sure that the words were really written by Mrs. Smith on Monday

B when he found that the words on the paper were not clear

C. because he had sold out all the meat in his shop

D. until he was paid enough by Mrs. Smith

3.From the story, we can know that the dog was very ___________.

4.At the end of the story, you’ll find that __________.

It was a winter morning, just a couple of weeks before Christmas 2005. While most people were warming up their ears, Trevor, my husband, had to get up early to ride his bike four kilometers away from home to work. On arrival, he parked his bike outside the back door as he usually does. After putting in 10 hours of labor, he returned to find his bike gone.

The bike, a black Kona 18 speed, was our only transport. Trevor used it to get to work, putting in 60-hour weeks to support his young family. And the bike was also used to get groceries (食品杂货) saving us from having to walk long distances from where we live.

I was so grieved that someone would steal our bike that I wrote to the newspaper and told them our story. Shortly after that，several people in our area offered to help. One wonderful stranger even bought a bike, then called my husband to pick ii up. Once again my husband had a way to get to and from his job. It really is an honor that a complete stranger would go out of their way for someone they have never met before.

People say that a smile can be passed from one person to another, but acts of kindness from strangers are even more so. This experience has had a spreading effect in our lives because it strengthened our faith in humanity (人性) as a whole. And it has influenced (影响) us to be more mindful of ways we, too, can share with others. No matter how or how small, an act of kindness shows that someone cares. And the results can be everlasting.

1.Why was the bike so important to the couple?

A．The man's job was bike racing.              B．It was their only possession.

C．It was a nice Kona 18 speed.               D．They used it for work and daily life

2.We can infer from the text that ________

A．The couple worked 60 hours a week         B．people were busy before Christmas

C．the stranger brought over the bike          D．life was hard for the young family

3.How did people get to know the couple's problem?

A．From radio broadcasts.                   B．From a newspaper.

C．From TV news.                          D．From a stranger.

4.The underlined word "grieved" in paragraph 3 probably means________.

A．upset            B．pleased           C．frightened         D．lucky

5.What do the couple learn from their experience?

A．Strangers are usually of little help.           B．One should take care of their bike.

C．News reports make people famous.          D．An act of kindness can mean a lot.

It is impossible not to make a mistake at some points in your life. We may as well accept that something will go wrong and we will be to blame. It is therefore sensible to work out some strategies for apologizing, and the best way to apologize is by letter. This way you can take care over every work you write— which you can’t do if you say sorry to someone in person.

We all say or do something that we wish we hadn’t said or done. You may say something that accidentally hurts someone, or you may provide a service which doesn’t come up to the standards that a client or customer expected.

You may feel that it was a genuine mistake which couldn’t be avoided. Rather than dwell on the mistake, you should quickly try to remedy（修补）the problem. An effective letter of apology is an important part of that process.

For the contents of the letter, just remember TABS—Timing, Action, Brevity, Sincerity.

The timing of a letter of apology is essential—it must be sent as soon as possible. Any delay in our sending the letter will only compound the problem. In this case “Better late than never” is not the best motto! The longer you wait before you wait before writing a letter of apology, the more it will seem that you have been coerced（被迫）into writing it.

Although it is important to recognize what has gone before, it is also essential to detail the action you plan to take to rectify whatever it was you did wrong. Research has shown that some indication that you have thought about what future action you plan to take is always well received.

A letter of apology should be brief and the word “sorry” should appear no more than twice. Indicate that you are aware using it a second time—“once again, I am so sorry for…” or “as I said earlier, I am really sorry about…”. Finally, the tone of the letter has to be sincere. In fact, the combination of all the above factors will help in this respect.

And don’t think that letters are out of date in the email—oriented 21st century. An apology email can be worse than no apology at all!

What kind of advice does the text suggest about apologizing?

A. It’s a good idea to write a letter of apology as soon as something has gone wrong.     

B. It’s a good idea to send several emails to apologize.

C. Write a long letter apologizing several times to make your point. 

D. Wait to see how they react to your letter before planning to do anything.

What kind of things do you NOT apologize for?

A. A service that is not as good as it should be.

B. Genuine mistakes.

C. Car accidents.

D. Causing offence or hurt.

The underlined expression “Rather than dwell on the mistake” in the third paragraph means you _____.

A. should not waste time worrying about what happened.  

B. should consider the problem

C. should forget about what happened.

D. should analyse who was at fault.

How can timing compound problems?

A. If you write immediately, they will be suspicious. 

B. If you leave it for a few days, they will know it is your idea to write.

C. Waiting for a few days before you write will show your sincerity.       

D. Waiting too long will make it worse because they won’t believe you mean it.