On Saturday nights, A.J.Coston doesn’t get a lot of sleep. Usually three or four times a night, a loud bell rings, a red light flashes, and he has to jump out of his bed. That’s because he’s a weekend volunteer firefighter（消防员）with Loudoun County Fire and Rescue Station 13 in Northern Virginia. During the week, he lives at home with his mom, dad and sister and does his main job which is going to high school.
“I have always wanted to get into firefighting since I was a little kid watching fire trucks go by,” he says. “One day on the Internet I noticed that Loudoun County offered a junior firefighter program.” He was only 16, but he got it.
Fighting fires is dangerous work. Firefighters never stop practicing the skills they need to stay safe. Once Coston learned those skills, he was allowed to work inside burning buildings.
“Teamwork is most important,” he says. “It’s the whole team that puts the fire out.”
Firefighters feel great about helping people. “My most unbelievable call was probably the time four kids were struck by lightning,” says Coston. He will be off to college next fall, building on his dream job. “I’ll get my degree in emergency（紧急情况） medical care. and then work in a fire and rescue company for a while. I want to be a flight doctor on a helicopter in the end, but I will never forget the days as a firefighter. These are my unforgettable experiences,” he says.
【小题1】 Coston can’t sleep well on Saturday nights because _____.

A．he has to work part-time at weekends

B．he has some sleeping problems

C．he has to do his job as a volunteer firefighter

D．he always worries that there may be a fire

A．Coston wanted to be a firefighter when he was a kid

B．Coston tried several times before he became a volunteer firefighter

C．firefighters feel proud that they can help people

D．firefighters have to practice skills all the time to stay safe

Even if  you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

   You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you. 来源：

   Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down. Because of gravity, you do not fall off the earth as it whirls (旋转) around. 来源：

   Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. Then spaceship will go so fast that it can escape (逃出) the earth’s gravity and carry you into space. 来源：

In this passage, the word “gravity” means_______.来源：

   A. the pull of everything.           B. the force of attraction(吸引) among objects.

   C. the force which attracts objects towards the centre of the earth来源：

   D. the force which attracts the earth towards the sun.

When you slip(滑) you always fall to the ground because________来源：

   A. the earth always turns round.                   B. the earth has gravity

   C. the earth’s gravity is greater than your weight.     D. you are careless. 来源：

Gravity is strong that_______

   A. it can throw a ball into the air.           B. it makes you jump only seven feet.

   C. it can let you fly away from the earth.     D. it can keep everything on earth.

Because of gravity,________

   A. water flows everything.            B. we can go everywhere by ship. 来源：

   C. water always flows downwards.     D. fish can live in water.

We can get away from the earth by spaceship because________

   A. the spaceship goes very fast.       B. the earth can’t pull the spaceship.

C. the spaceship has a strong force.    D. the spaceship can jump higher than others.

Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

　 You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you.

　 Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down. Because of gravity, you do not fall off the earth as it whirls (旋转) around.

　 Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. Then spaceship will go so fast that it can escape (逃出) the earth’s gravity and carry you into space.

1. In this passage, the word “gravity” means_______.

　 A. the pull of everything.　　　　　 B. the force of attraction(吸引) among objects.

　 C. the force which attracts objects towards the centre of the earth

　 D. the force which attracts the earth towards the sun.

2. When you slip(滑) you always fall to the ground because________

　 A. the earth always turns round.　　　　　　　　　 B. the earth has gravity

　 C. the earth’s gravity is greater than your weight.　　 D. you are careless.

3. Gravity is strong that_______

　 A. it can throw a ball into the air.　　　　　 B. it makes you jump only seven feet.

　 C. it can let you fly away from the earth.　　 D. it can keep everything on earth.

4. Because of gravity,________

　 A. water flows everything.　　　　　 B. we can go everywhere by ship.

　 C. water always flows downwards.　　 D. fish can live in water.

5. We can get away from the earth by spaceship because________

　 A. the spaceship goes very fast.　　　 B. the earth can’t pull the spaceship.

C. the spaceship has a strong force.　 D. the spaceship can jump higher than others.