Seen from , the earth appears to be a big blue ball. [ ]A. the space B. spaceC. a spaceD. this spaceg 题目和参考答案——青夏教育精英家教网—

题目内容

Seen from ___, the earth appears to be a big blue ball.

[ ]

A. the space
B. space
C. a space
D. this space

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What do you do if you're stranded（处于困境的）on a lonely island? Surely you need to find a way to get in touch with the outside world. Your best chance of doing this is to draw the attention of a passing plane.
　　Body signals（信号）
　　Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes". When you point downwards and swing your arm from side to side, it means "no". If you want the pilot to know that it's safe to land, push your hands out in front of you and bend（弯曲）your knees. If you want to say that it's not safe to land, put your arms in the air and move them to one side.
　　Smoke signals
　　The smoke from a fire can be seen from far away, so it's a good way to draw attention. If the weather is dry, it isn't hard to start a fire. Remember, however, that fires can be very dangerous if they get out of control. Never light a fire unless you're sure that it can't spread. If the ground is dark, light smoke can be seen more easily. Green grass and leaves produce light smoke.
　　Ground-to-air signals
　　It's a good idea to build some signals, too. Use large pieces of wood to make the symbols(标记). If you can't find any wood, use earth. Some useful symbols are:
　　F "I need food and water."
　　II "I need medicine."
　　I "I am badly hurt."
　　X" I am unable to move from here."
　　Pilots' replies
　　If the pilot lowers the plane's wings from side to side, this means "message received and understood". (At night, the pilot flashes the plane's green lights.) If the pilots flies the plane in a clockwise circle, this means "message received but not understood".(At night, the pilot flashes the plane's red lights.)
However, there is no signal which means "message not received". Why not?
【小题1】 Which picture means "it's not safe land"?

　
【小题2】 What can we learn from the passage?

A．Swinging your arm from side to side means "yes".

B．If the ground is dark, light smoke can't be seen.

C．If you need some medicine, make a symbol "II".

D．The pilots make replies with a blue light at night.

　　【小题3】 What is the passage mainly about?

A．The explanation of building signals on an island.

B．The importance of making signals on an island.

C．Ways of sending out signals on a lonely island.

D．Ways of receiving signals from a lonely island

Sitting on exercise balls brings more than a smile to students and teachers.
Some fourth-graders at Conrad Weiser West Elementary School in Womelsdorf love their new chairs-—probably because they're not really chairs at all.
The kids are sitting on the air-filled balls. But different from those just for exercise, these have small legs that keep them from rolling. Sitting on a chair all day in school can make anyone want to move around. So, more and more teachers are letting students have a ball. By using exercise balls instead of common chairs, teachers find students' posture(姿势) and attention improved.
Dotti Pownall, a fifth-grader teacher in West Virginia, has been using balls as chairs since December 2008. "The students love them." she says. Pownall took a survey of her students. She found that 80 percent, thought sitting on the balls helped them concentrate(专注) better:
"Besides, they’re fun,b" says Pownall.
According to WittFitt,b a company that has sold balls to more than 200 schools, they can improve kids' posture and classroom behavior.
Exercise ball chairs are getting popular in classrooms, from preschool to college. Some adults (成人) even use them at work.
Lisa Witt felt so strongly about the use of balls as chairs that she started WittFitt. She said the company not only encourages the use of balls but also educates teachers and students on how to use them. "We sell balls in 24 states in America, three provinces in Canada and Japan." says Witt.
【小题1】Sitting on exercise balls can______.

A．improve students' attention	B．make students smarter
C．keep students moving around	D．help students become fit

【小题2】According to the passage, the company WittFitt______.

A．began to produce balls in 2008	B．sells balls in 24 countries
C．was set up by Lisa Witt	D．is famous around the world

【小题3】It can be seen from the passage that ______.

A．exercise balls have no legs	B．Pownall works as a teacher
C．students hate exercise balls	D．exercise balls are filled with sand

【小题4】The passage mainly tells us about______.

A．the shape of exercise balls	B．the use of exercise balls
C．the number of exercise balls	D．the inventor of exercise balls

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?

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.

　　Body signals（信号）

　　Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes". When you point downwards and swing your arm from side to side, it means "no". If you want the pilot to know that it's safe to land, push your hands out in front of you and bend（弯曲）your knees. If you want to say that it's not safe to land, put your arms in the air and move them to one side.

　　Smoke signals

　　The smoke from a fire can be seen from far away, so it's a good way to draw attention. If the weather is dry, it isn't hard to start a fire. Remember, however, that fires can be very dangerous if they get out of control. Never light a fire unless you're sure that it can't spread. If the ground is dark, light smoke can be seen more easily. Green grass and leaves produce light smoke.

　　Ground-to-air signals

　　It's a good idea to build some signals, too. Use large pieces of wood to make the symbols(标记). If you can't find any wood, use earth. Some useful symbols are:

　　F "I need food and water."

　　II "I need medicine."

　　I "I am badly hurt."

　　X" I am unable to move from here."

　　Pilots' replies

　　If the pilot lowers the plane's wings from side to side, this means "message received and understood". (At night, the pilot flashes the plane's green lights.) If the pilots flies the plane in a clockwise circle, this means "message received but not understood".(At night, the pilot flashes the plane's red lights.)

However, there is no signal which means "message not received". Why not?

1. Which picture means "it's not safe land"?

2. What can we learn from the passage?

　　A. Swinging your arm from side to side means "yes".

　　B. If the ground is dark, light smoke can't be seen.

　　C. If you need some medicine, make a symbol "II".

　　D. The pilots make replies with a blue light at night.

　　3. What is the passage mainly about?

　　A. The explanation of building signals on an island.

　　B. The importance of making signals on an island.

　　C. Ways of sending out signals on a lonely island.

D. Ways of receiving signals from a lonely island

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