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.

A recent survey of 2000 parents in Britain showed that they are often afraid of science questions asked by their curious children only because they have no idea what the answer is. Here is a list of some simple questions that you can ask your parents to see if they know the answers.

    Q: Why is the sky blue?

    A: You probably know white sunlight is made up of seven colors. While it moves in a straight line when going through space, it starts to divide as it hits “raised area” in the atmosphere. The ones with longest wavelengths pass through easily. The blue , however , can be taken in by the gas molecules (分子) because it has a shorter wavelength , which in turn scatters (使分散) it in different directions. That’s why when you look up at the sky, it appears to be blue.

    Q:Why does the moon sometimes appear during the daytime?

    A: The simple answer to that is because just like any other object it is being lit by the sun. As long as it is around 45 degrees or even 90 degrees off the sun, it will receive light and be able to be seen. The only time it is not able to be seen during its 28-day orbit (轨道) around the earth is when it is right between the earth and the sun. That’s because its back , which is not lit by the sun, is facing us.

    Q: Where do birds/ honeybees go in winter?

    A: While the bird part is quite easy, since a lot of them get together and travel, the honeybee part is likely to puzzle your parents. It turns out that these busy insects stop being that active when the temperature drops below 50°F. Instead ,they get together in the lower central area of the hive （蜂巢）and form a ball around their queen. This helps keep both warm enough to survive the cold winter months.

1.The sky looks blue mainly because the color blue in the sunlight_______.

A. has the longest wavelength among all the colors

B. cannot be taken in by the gas molecules

C. doesn’t hit “raised area” in the atmosphere

D. cannot pass through space successfully

2.How long can’t the moon be seen during the daytime in a month?

A. 2                             B. 28                           C.30                                      D. 31

3.What do honeybees choose to do when the temperature drops below 50°F?

A. They choose to be active in the wild.

B. They choose to keep themselves warm.

C. They choose to travel to a warm place.

D. They choose to get together in the upper central area of the hive.

4.What is NOT explained in the passage?

A. Why is the sky blue?

B. Why is the moon able to be seen during the daytime?

C. Why do birds travel in winter?

D. Where do honeybees go in winter?

The Internet has become not only a necessary but also a virtual(虚拟的) world for people. With the development of the Internet, internet friendship has also become very popular. Online friends are those people who have known each other through the Internet. Making internet friends is the same as making pen friends. Many famous websites offer quite warm internet friendship. One can find many people on these websites and they share the same interests. It is difficult to make friends with someone you can’t see or feel. That is the main problem of internet friendship. A virtual friendship would not last forever without seeing each other, but it is an advantage for some people because they are afraid to speak in pubic.

  On the other hand, the chances of cheating(欺骗) are very high in an internet friendship. Some people make friends on the Internet with wrong intentions(企图).So while making friends over the Internet, one has to be very careful. Here are some suggestions for you.

  ·Don’t give personal information, such as your telephone number, address, location, school name as well as your parents’ information, to strangers on the Internet.

·Do not exchange personal photos of you or any family member with people you meet over the Internet.

·Do not go to meet a person you have just met over the Internet. You’d better ask older or other experienced people for advice if you want to go to meet an internet friend.

·Do not accept someone’s request(要求) if you feel he or she is dishonest.

根据上面短文的内容回答问题。

1.Is the Internet necessary and virtual for people?

  ______________________________________________________________________

2.What is the main problem of internet friendship?

  ______________________________________________________________________

3.Why is the virtual friendship an advantage for some people?

  ______________________________________________________________________

4.Who can you ask for advice if you go to meet an internet friend?

  ______________________________________________________________________

5.What does the article give suggestions about?

  ______________________________________________________________________