Should we be afraid of sharks(鲨鱼)? Maybe not. New research into the reasons for shark attacks (攻击) suggests that sharks don’t like the way humans taste! In fact, most people who are attacked by the shark are still alive after receiving only one bite (咬). Why is this?

     There are many opinions to explain why sharks sometimes attack people. One opinion is that sharks are just curious (好奇的). We know that sharks are the strongest animals in their environment, so they are not afraid of anything. Naturally, that means they are curious when they meet something unusual. Because they don’t have hands or feet., the only way they can find out an object is to bite it! It is thought that sharks sometimes bite humans for this reason, and then swim away.

     Scientists also say that sharks would not waste energy trying to eat a human, as we have a lot of bones (骨头). It is hard for a shark to eat us because sharks don’t have hands, and they can’t pull the meat off our bones. Maybe that’s why they only bite us once. Unluckily, one bite from a large shark is serious enough to hurt people greatly!

     Another opinion is that sharks attack humans by mistake. Some sharks may sometimes mistake humans for a seal. An example of this is when a shark  attacks a surfer. A surfer lying on a surfboard looks like a seal when seen from below. Sharks like seals because they have thick fat.

     Whatever the reason for shark attacks on humans, sharks should be afraid of us. Sadly, we kill almost 40 million of them each year.

1.What happens to people attacked by sharks?

A. Most of them because blind.          B. Most of them because of deaf.

C. Most of them died.                  D. Most of them are still alive.

2. How do sharks find out about an unusual object according to the passage?

A. By biting.                         B. By smelling.

C. By touching.                       D. By killing.

3.Which sentence about sharks is true?

A. Sharks pull meat off bones when they eat.

B. Sharks might mistake humans for seals.

C. Sharks like to attack surfers because of their thick fat.

D. One bite from a shark is nothing serious.

4.What would the author write the passage mainly for?

A. To tell surfers to stay away from sharks.

B. To ask people to stop killing sharks.

C. To let us know the reasons for shark attacks on people.

D. To show that humans are much stronger than sharks.

 

Should we be afraid of sharks? Maybe not. New research into the reasons for shark attacks (攻击) suggests that sharks don’t like the way humans taste! In fact, most people who are attacked by the shark are still alive after receiving only one bite (咬). Why is this?

There are many opinions to explain why sharks sometimes attack people. One opinion is that sharks are just curious (好奇的). We know that sharks are the strongest animals in their environment, so they are not afraid of anything. Naturally, that means they are curious when they meet something unusual. Because they don’t have hands or feet., the only way they can find out an object is to bite it! It is thought that sharks sometimes bite humans for this reason, and then swim away.

Scientists also say that sharks would not waste energy trying to eat a human, as we have a lot of bones (骨头). It is hard for a shark to eat us because sharks don’t have hands, and they can’t pull the meat off our bones. Maybe that’s why they only bite us once. Unluckily, one bite from a large shark is serious enough to hurt people greatly!

Another opinion is that sharks attack humans by mistake. Some sharks may sometimes mistake humans for a seal. An example of this is when a shark attack attacks a surfer. A surfer lying on a surfboard looks like a seal when seen from below. Sharks like seals because they have thick fat.

Whatever the reason for shark attacks on humans, sharks should be afraid of us. Sadly, we kill almost 40 million of them each year.

1.What happens to people attacked by sharks?

A．Most of them because blind.               B．Most of them because of deaf.

C．Most of them died.                      D．Most of them are still alive.

2.How do sharks find out about an unusual object according to the passage?

A．By biting.                              B．By smelling.

C．By touching.                           D．By killing.

3.Which sentence about sharks is true?

A．Sharks pull meat off bones when they eat.

B．Sharks might mistake humans for seals.

C．Sharks like to attack surfers because of their thick fat.

D．One bite from a shark is nothing serious.

4.What would the author write the passage mainly for?

A．To tell surfers to stay away from sharks.

B．To ask people to stop killing sharks.

C．To let us know the reasons for shark attacks on people.

D．To show that humans are much stronger than sharks.

 

DNA is the whole “map” of the human body. It is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our parents, because we get some of their DNA to make our own.

People have been trying to understand the human body for a long time, In1860, Mr Mendel discovered why we look the same as other people in our family. It is because of small things called “genes”(基因) in our body. In 1953, two scientists, Watson and Crick, found out that those small parts are really messages . They’re written in the DNA with a special language.

In1961, another two scientists found the first “word” that they could understand in that language. It shows how DNA tells the cell﹙细胞﹚to build its parts. So far, scientists have found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word ”means, we can help to save people from several illness. So the more we understand, the more doctors will be able to do.

Most people hope that this will help to make better medicine and help sick people. Other people worry that when we learn more “words” and find out more information, we will use it in the wrong way, just to make people more attractive (有吸引力的)，or stop sick people getting jobs.

1.When did Mr Mendel discover why we look the same as other people in our family?

A. In 2000.     B. In 1961      C. In 1953     D In 1860

2.What did the two scientists find in 1961? They found_____.

A．all the words in the DNA map

B．Small things called “genes” in our body

C．The first “word” they could understand in that language

D．those small parts are written in the DNA with a special language

3.How can we help sick people if we understand more “words” in the DNA map?

A．Make better medicine.                   B．Make them get jobs.

C．Make maps for them.                    D．Make them attractive

4.Which one is not true according to the article?

A．We look like our parents because of “genes” in our body

B．We have understand what all the words in the DNA map do

C．DNA is the whole “map” of the human body.

D．DNA tells the cell to build its parts.

5.What do people think about this research about DNA?

A．It can be only bad                       B．It can be only good

C．It can be good but won’t work            D．It can be good and bad

 

TOKYO, JAPAN--What do you do when you see a cockroach (蟑螂）？ Do you hit it with a newspaper? Do you step on it?

When researchers at Tokyo University see a cockroach, they take the remote control and make the cockroach turn around, run left or right, or go forward. These scientists are changing the cockroaches into robots. Each cockroach has a very small pack that has in it a microprocessor(微处理器）.Then researchers can send signals from the remote control to the pack. The signals control the movements of the cockroaches.

Why does anyone want to control a cockroach? “Insects can do many things that people can’t,” says Isao Shimoyama, head of robot research at Tokyo University. In a few years, he says, these robot insects will carry very small cameras. They will be able to move through earthquake rubble(瓦砾）to look for people or move under doors to find information about someone.

This may seem strange, but the Japanese government thinks the research is very important. The government is giving the scientists $ 5 million for this research.

First, the researchers breed (培育)hundreds of cockroaches. They use only the American cockroach because it is bigger and stronger than other cockroaches. Then they choose the best cockroaches and remove their wings and antennae(触须）. They put small packs where the antennae were. The packs weigh about three grams, or about two times the weight of the cockroaches themselves. “Cockroaches are very strong,” says Ralph Holzer, who is a researcher at Tokyo University. “They can lift 20 times their own weight. ”

With a remote control, the scientists send signals to the packs. When a cockroach gets the signal, it moves. The problem is that the cockroaches don’t always move in the right direction.

1.The scientists are changing the cockroaches into robots because ______.

A．they want cockroaches to do things people can’t in the future

B．they want to control the movements of the cockroaches

C．they want cockroaches to take photos of the earthquakes

D．they want to send signals to the packs on the cockroaches

2.What can cockroaches do to help people?

A．They can lift 20 times their own weight.

B．They can help people to carry very small cameras.

C．They can breed hundreds of cockroaches.

D．They can search for those people in rubble after an earthquake.

3.Scientists control cockroaches’ movements ______.

A．by removing their wings

B．by sending signals from the remote control

C．by using very small cameras

D．by removing their antennae

4.What problem do the rcscarchcrs meet with?

A．The cockroachcs sometimes clon;t move.

B．The cockroachcs sometimes move in ihc wrong direction.

C．The cockroachcs arc too big to move through earthquake rubble.

D．The cockroachcs can only lift 20 times their own weight.

 

 

One night, I wondered what it would be like if I only asked questions. I decided that no matter what anyone said to me the next day, I would reply only with   36  .

I loved to read about scientists and their discoveries, and I knew that scientists always started their research with a question. I hoped that I could become a scientist. Maybe by asking questions, I could train my mind to be   37  .

  I survived the morning easily. “Is there any egg?” I answered when my mother asked what I wanted for breakfast. “Is this seat taken?” I asked when my friend Mike asked where he was going to   38   on the bus.

In the classroom, Mr. Black spoke slowly and clearly while I listened carefully. The problem had been part of my homework the night before. I wrote the answer on the board, “Could the answer be 361?”

  Mr. Black smiled and nodded. I thought,“How did I   39   to get through that?” I almost laughed because asking questions really was starting to become a   40  .

  I thought I had made it safely through the whole day,   41   what I had come to consider my experiment blew up at the dinner table when my dad asked me about my day. “What do I always do?” I replied.

My parents looked at each other. My father   42   again. “Well, I hope you went to school,” he said.

    “Uhhh … why would you think otherwise?” I asked. My parents exchanged another   43    

and were becoming annoyed.

   “Do you think questions are a good way to train your mind to be active?” I asked.

“It   44   the question,” said my father. “Some questions are asked for   45   information. Those are good mind-training questions. Sometimes, people use questions to get the other person to say something. Sometimes people ask questions to get someone to agree with them. Those questions don’t really achieve anything.”

   “I guess my experiment didn’t work,” I said, and I told my father about my   46  .

“I think it worked   47  !” my father said. “You made a discovery, didn’t you? What matters is that you have put your idea into practice.”                               

1.A. actions              B. answers             C. gestures             D. questions

2.A. deep             B. free            C. quick            D. strong

3.A. get                  B. sit                 C. come         D. take

4.A. fail             B. have            C. want             D. manage

5.A. habit            B. step                C. goal                 D. rule

6.A. or               B. so                  C. but              D. and

7.A. tried             B. asked            C. guessed           D. ordered

8. A. look                B. word            C. mind                 D. topic

9.A. refers to            B. belongs to     C. puts on          D. depends on

10.A. sending         B. finding             C. sharing         D. keeping

11.A. test            B. idea            C. plan                 D. wonder

12.A. slowly              B. safely          C. perfectly            D. properly