In normal conditions，bread will go mouldy(霉)in around 10 days．But an American company says it has developed a technique that will keep the bread mould free for two months.

At the laboratory or Texas Tech University，chief executive Don Stull showed off the long，metallic microwave device. Originally designed to kill some bacteria, the researchers discovered it could kill the mould spores（霉孢）in bread in 10 seconds. “We treated a slice of bread in the device, we then checked the mould in the bread over time,”he explained.“And at 60 days it had the same mould content as it had when it came out.”

The machine uses much the same technology as found in commercial microwaves—but with some important differences, according to Mr. Stull.“We introduce the microwave frequencies in different ways, through a radiator. We don’t get the hot and cold spots you get in your home microwave.”

The device has attracted plenty of bread manufacturers—but it is worried that it could push up costs in an industry. And there is also a concern that consumers might not take to bread that lasts for so long.

Mr. Stull acknowledges it might be difficult to convince some people of the benefits. “We’ll have to get some consumer acceptance of that,” he said. “Most people do it by feel, and if you still have that quality feel, they will probably accept it.”

Mr. Stull believes that the technology could affect bread in other ways. He said that bread manufacturers added lots of additives（添加剂）to fight mould. As a result, they must add extra chemicals to mask the taste of them. If bakers were able to use the microwave technology, they would be able to avoid these additives. While a wholesale change in the bread industry might be difficult to achieve, there may be more potential with other foods.

71.The microwave device was originally designed to___________.

A. make bread tasty                            B. kill some bacteria

C. kill the mould spores                D. check mould in bread

72.What do the metallic device and commercial microwaves have in common?

A. they both can kill mould spores.              B. They both function through a radiator.

C. They both use microwave technology.     D. They both can be used as a bread bakery.

73.According to Mr. Stull, the microwave technology _________.

A. may push up costs in the bread industry

B. will keep the bread more tasty after 60 days

C. can help bakers to avoid adding additives

D. might probably bring no benefits to consumers

74.What does the underlined word“them”refer to?

A. Chemicals.        B. Additives.          C. Manufacturers.         D. Foods.

75.It can be inferred from the text that__________.

A. bread made with the technology will have different taste

B. bread industry will pay no attention to the technology

C. the technology is as harmful as the additives

D. the technology is likely to be used more widely

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

If you like exploring the wilderness, you should read the following suggestions from search-and-rescue rangers(搜救队) in the national parks.    1   

Before you head out on a hike, check the weather, take plenty of water, and make sure someone knows where you’ll be and when you’ll be back. Bring clothes to keep you warm when wet, like a waterproof jacket. Avoid cotton, which traps damp.    2    Take basic precaution, such as waterproof matches, a folding saw, a good knife, a first-aid kit, a flash light, and batteries.

The minute you think you might get lost, stop.    3   And you should stay calm and think rationally(理性地). If you are not alone, focusing on the needs of others can help hold your own fears at bay. Keeping a sense of humor helps too.—it reduces stress and promotes creative thinking.

In general, people who try to find their own way out are far worse than those who stay put（呆在原处).    4    In a wide-open area, make a signal with colorful gear, make a big X out of rock, or dig a shallow trench, which are easy to spot from above.

You can go several days without eating, so in most cases, you’d better not search for food, since there are lots of poisonous plants in the wild. But you need to stay hydrated(含水的).    5   If you are lost in your car, stay there: You are more visible to rescuers. And the car provides shelter.

A．Stay visible so anyone searching can see you.

B．First, you’ve got to acknowledge you’re in trouble.

C．And you have no idea where to go.

D．The search-and-rescue people call it death clothes.

E. First of all find a shelter and stay in it in order to keep dry.

F. These suggestions may keep you alive in emergencies.

G. If you run out of water, It’s usually better to drink from a stream with suspect water than to go without.

 

If you see someone drowning, speed is very important. Once you get him out of the water, if he isn’t breathing, you have four minutes before his brain is completely destroyed. Support his neck, lift his head back and press his chin upwards. This stops the tongue blocking the airway in the throat and is sometimes enough to get him breathing again. If that doesn’t work, start mouth-to-mouth breathing. Press his nostrils (鼻孔)together with your fingers .Open you mouth and take a deep breath. Blow into his lungs until his chest rises, then remove your mouth ,and watch his chest fall. Repeat twelve times a minute. Keep doing until help arrives.
To bring a child back to life, keep your lips around his mouth and nose and gently blow into his mouth. Give the first four breaths as quickly as possible to fill the blood with oxygen. If , in spite of your efforts, he starts turning a blue-grey color, you can feel no pulse(脉搏). Then pressing is the last chance of saving his life.
With arms straight, rock forwards, pressing down on the lower half of the breastbone. Don’t be too hard or you may break a rib (肋骨). Check how effective you are by seeing if his color improves or his pulse becomes independent to your chest pressing. If this happens, stop the pressing. Otherwise continue until rescue arrives.
【小题1】This passage is mainly about __________.      .

A．how to save people out of the water

B．how to give first aid to people who are drowning

C．how to do mouth-to –mouth breathing

D．how to save a child from a river

【小题2】Once you get a drowning man out of the water, if he isn’t breathing, you must first _______. 

A．get him breathing again

B．take him to the nearest hospital as soon as possible

C．find someone to help you

D．call the First Aid Center

【小题3】 If the drowning boy has no pulse, ____________.

A．pressing his chin upwards in enough to get him breathing

B．blowing air into his mouth is sure to save his life

C．pressing his nostrils together with your fingers can work

D．pressing is the last chance of saving his life

【小题4】Which of the following statements is true?

A．If a man does not breathe for four minutes, his brain will be completely destroyed.

B．If you see someone drowning, you must give him mouth –to – mouth breathing.

C．Don’t stop pressing his chest, if the drowning man starts breathing again.

D．When pressing, you can do it as hard as you can.

If you see someone drowning, speed is very important. Once you get him out of the water, if he isn’t breathing, you have four minutes before his brain is completely destroyed. Support his neck, tilt(使翘起)his head band and press his chin(下巴)upwards. This stops the tongue blocking the airway in the throat and is sometimes enough to get him breathing again. If that doesn’t work, start mouth-to-mouth breathing. Press his nostrils(鼻孔)together with your fingers. Open your mouth and take a deep breath. Blow into his lungs until his chest rises, then remove your mouth and watch his chest fall. Repeat twelve times a minute. Keep doing until help arrives.

To bring a child back to life, keep your lips around his mouth and nose and gently blow into his mouth. Give the first four breaths as quickly as possible to fill the blood with oxygen. If , in spite of your efforts, he starts turning a blue-gray color, and you can feel no pulse(脉搏),then pressing is the last chance of saving his life

With arms straight, rock forwards, pressing down on the lower half of the breastbone. Don’t be too hard or you may break a rib(肋骨). Check how effective you are seeing if his color improves or his pulse becomes independent to your chest pressing. If this happens, stop the pressing. Otherwise continue until rescue arrives.

1．This passage is mainly about　　   .

A. how to save people out of the water

B. how to give first aid to people who are drowning

C. how to do mouth-to-mouth breathing

D. how to save a child from a river

2．Once you get a drowning man out of the water, if he isn’t breathing, you must first　　    .

A. get him breathing again

B. take him to the nearest hospital as soon as possible

C. find someone to help you

D. call the First Aid Center

3．In the last paragraph, the word “rescue” means　　　　 .

A. breath　　　　   B. help　　    C. doctor　　　　  D. pulse

4．If the drowning boy has no pulse,　　　　 .

A. pressing his chin upwards is enough to get him breathing

B. blowing air into his mouth is sure to save his life

C. pressing his nostrils together with your fingers can work

D. pressing is the last chance of saving his life

5．Which of the following statements is true?

A. If a man does not breathe for four minutes, his brain will be completely destroyed.

B. If you see someone drowning, you must give him mouth-to-mouth breathing.

C. Don’t stop pressing his chest, if the drowning man starts breathing again.

D. When pressing, you can do it as hard as you can.