Scientists have proved that sleeping and learning go hand in hand. Even a short nap can boost our memory and sharpen our thinking. But the relationship goes deeper than that.

“The brain is not passive while you sleep,” scientist Anat Arzi said. “It’s quite active. You can do many things while you are asleep.”

Arzi and her coworkers didn’t try to teach the sleeping volunteers any complex information, like new words or facts. Instead, the scientists taught volunteers to make new connections between smells and sounds.

When we smell something good, like a flower, we take deep breaths. When we smell something bad, we take short breaths. Arzi and her co-workers based their experiment on these reactions.

Once the volunteers fell asleep in the lab, the scientists went to work. They gave them a whiff of something pleasant and meanwhile played a particular musical note. They didn’t wake up, but they heard—and sniffed(吸气) deeply. Then the scientists gave the volunteers a whiff of something terrible and played a different musical note. Again, the volunteers heard and smelled—a short snort this

time—but didn’t wake up. The researchers repeated the experiment.

After just four repetitions, volunteers made a connection between the musical notes and their paired smells. When the scientists played the musical tone that went with good smells, the sleepers breathed deeply. And when the scientists played the musical tone that went with bad smells, the sleepers breathed briefly—despite there being no bad smell.

The next day, the volunteers woke up with the sound-smell connection. They breathed deeply when hearing one tone and cut their breaths short when hearing the other, which must have been unusual for them. Imagine walking down the street and taking a deep breath upon hearing a particular sound!

1.In the study, the volunteers were taught _______. 

A．to become active during sleep

B．to tell the difference between smell

C．to learn new words and scientific facts

D．to make sound-smell connections

2. How did the volunteers react when smelling something nice and hearing musical notes?

A．They took a deep breath.                 B．They had a wonderful dream.

C．They woke up at once.                   D．They took a short breath.

3. When the volunteers woke up the next day, they_______.

A．learned how to play to musical tones

B．forgot what happened during their sleep

C．continued with the sound-smell connection

D．changed their reaction when hearing.

4.The passage mainly tell us______

A．special smells and sounds can improve our memory.

B．our brain can actually learn something new during the sleep.

C．the volunteers will always hear similar sounds in the street.

D．our brain can tell the difference between smells during the sleep.

5.Which of the following is NOT true?

A．A short sleep can improve our memory and sharpen our thinking.

B．Arzi and her coworkers didn’t try to teach the sleeping volunteer some simple information.

C．When the volunteer smelt something terrible, they didn’t wake up.

D．After four repetitions, volunteers made a connection between the musical notes and their pared smells.

Hidden passengers traveling in ships, trams, or even cars can be a terrible trouble — especially when they are insects. As for this, there is a great    1   between human beings and insects. The    2   take every possible effort to avoid being discovered, while the latter quickly    3   attention to themselves.
We can only show mercy to the    4   man who had to stop his car soon after setting out from a country village to drive to London. Hearing a strange noise from the
   5   of the car, he naturally got out to examine the wheels carefully, but he found nothing wrong, so he    6   his way. Again the noise began,   7   and became even louder. Quickly turning his head, the man saw what appeared to be a great   8      cloud following the car. When he stopped at a village further on, he was told that a queen bee must be hidden in his car as there were thousands of bees    9  .
On learning this, the man drove away as quickly as possible. After an hour's    10  driving, he arrived safely in London, where he parked his car outside a    11   and went in. It was not long before a customer who had seen him arrive    12   in to inform him that his car was    13   with bees. The poor driver was    14   that the best way should be to call a    15  .In a short time the man arrived. He found the unwelcome passenger hidden near the wheels at the back of the car. Very thankful to the driver for this unexpected gift, the bee-keeper took the queen and her thousands of followers home in a large box. 

On hearing a great noise, Mike looked forward through the window _____

what happened outside the room.

  A. to seeing B. to see C. seeing D. to have seen

He is looking forward __________his father.

A．of receiving        B．of hearing from     C．to hear from       D．to hearing from

There are many kinds of friends. Some are always    36   you, but don't understand you. Some say only a few words to you, but understand you. Many people will step in your life, but only   37  friends leave footprints.

　　I shall always recall (回忆) the autumn and the girl with the  38  . She will always bring back the friendship between us. I know she will always be my best friend.

　　It was the golden season. I could see the yellow leaves   39  on the cool  40 . In such a season, I liked walking alone in the leaves,  41   to the sound of them.

　　Autumn is a  42   season and life is uninteresting. The free days always get me   43  . But one day, the sound of a violin   44   into my ears like a stream (小溪) flowing in the mountains. I was so surprised that I jumped to see what it was. A young girl, standing in the wind, was  45   in playing her violin.

　　I had  46  seen her before. The music was so nice that I listened quietly. Lost in the music, I didn't know that I had been   47  there for so long but my existence (存在) did not seem to disturb her.

　　Leaves were still falling. Every day she played the violin in the corner of the building  48  I went downstairs to watch her performance. I was the only listener. The autumn seemed no longer lonely and life became   49  .  50  we didn't know each other, I thought we were already good friends. I believe she also loved me.

Autumn was nearly over. One day, when I was listening carefully, the sound suddenly

   51  . To my astonishment (惊讶), the girl came over to me.

　　“You must like violin.” she said.

　　“Yes. And you play very well. Why did you stop?” I asked.

　　Suddenly, a   52  expression appeared on her face and I could feel something unusual.

　　“I came here to see my grandmother, but now I must leave. I once played very badly. It was your listening every day that   53  me.” she said.

　　“In fact, it was your playing   54  gave me a meaningful autumn,” I answered, “Let's be friends.”

　　The girl smiled, and so did I.

I never heard her play again in my life. I no longer went downstairs to listen like before. Only thick leaves were left behind. But I will always remember the fine figure (身影) of the girl. She is like a   55 —so short, so bright, like a shooting star giving off so much light that it makes the autumn beautiful.