题目内容

Everyone knows that death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases---clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.

Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.

To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.

1.For a person who suffers from the clinical death _________

A.he is still very much alive.

B. he can not avoid final death.

C. his most important organs are damaged.

D. he still has the possibility of getting back to life.

2. Scientists try to make the time of clinical death longer in order to _________

A.cool the organism.

B.delay the coming of biological death.

C. slow down the body’s metabolism.

D. bring vital cells and tissues back to active life.

3. How did the scientists put Keta into clinical death?

A.By putting her to sleep, lowering her temperature and draining her blood.

B.By surrounding her body with ice-bags and draining her blood.

C.By lowing her blood pressure and stopping her heart from beating.

D.By draining her blood, lowering her blood pressure and stopping her breathing.

4.All of the following indicate that the monkey has almost restored to her original physical state except the fact that _________

A.her heart beat again.

B.she rejected a penicillin injection.

C. she regained her normal breath.

D.she acted as lively as a healthy monkey.

练习册系列答案
相关题目

When you're on the go, your best friend and resource can be your phone. In the age of smart phones, apps are like guiding stars: They can point you in the right direction for a hotel, list expenses, send postcards, and much more. When used together, these apps can be the basic travel tool, placing a wealth of information at your fingertips no matter where you are on the planet. U.S. News Travel has picked the essential travel apps, known for their utility and reliability. Best of all, they cost absolutely nothing.

Trip It

Your Personal Travel Agent

Be your own travel agent and plan every detail of your trip—from car rental to accomadating restaurants—with Trip It. You can make travel schedule by hand, or simply forward the email confirmations of your flight, rental car, train tickets, and hotels to plans.

Weather Free

Your Go-To Meteorologist(气象学者)

Stop trying to explain the weather forecast on the evening news (particularly when it's in a foreign language). The Weather Free app informs you (in English) of the climate in various locations. It features the local weather, and other key factors that will inform your decision about what to wear before stepping outside.

Goby

Your Event Guru

When you're in a foreign city, you sometimes look around and ask: Where are all the people? Goby has the answer. This app pinpoints the neighborhood hot spots (including museums, hotels, eateries, and more) in your neighborhood. But its true value comes in finding nearby events. You'll discover concerts, plays, and more right around the corner.

1.What is the advantage of using travel apps picked by the U.S. News Travel?

A. They can solve any problem you come across.

B. They reduce your travel budget.

C. They exercise your fingertips.

D. They are reliable and free of charge.

2.With the help of the travel apps used together, travelers can do the following things EXCEPT__________.

A. rent a car

B. decide what to wear

C. look for a friend while traveling

D. find the nearby museums

3.Where are the readers likely to read the passage above?

A. In a geography textbook

B. In a science and technology magazine

C. On a popular website

D. In a business report

A tailgate party is a social event held on and around the open tailgate of a vehicle. Tailgating, which originated in the United States, often involves consuming alcoholic drinks and frilling food. Tailgate parties usually occur in the parking lots at stadiums, before and occasionally after games and concerts. People attending such a party are said to be tailgating. Many people participate even if their vehicles do not have tailgates.

The idea for eating out of the back of a car may have started in 1866 with Charles Goodnight, a Texas farmer. He noticed that the cowboys he employed needed a way to eat on the road, so he transformed a U. S. Army wagon(马车) into a mobile kitchen. There, hungry workers could eat, relax, and socialize after a long day of working.

Nowadays, people tailgate for lots of reasons, everything from college football games to Jimmy Buffet concerts. In schools and communities, some athletic departments, coaches and parents of student athletes rely on post-game tailgating parties to build community and support for their program and team.

What people consider essentials(必备)for tailgating spreads isn’t the same across the country. Different areas of the country have their own favorite foods for tailgating. While foods like burgers and chips may be common everywhere, some areas have specialties. For instance, those in Louisiana may consider jambalaya a tailgating must, while those in the Midwest simply can’t go without brats. And the West Coast? Don’t be surprised to see grilled fish or pasta. While dishes may differ from area to area, one thing is the same across the country: beer.

1.Why did Charles Goodnight invent a mobile kitchen?

A. To show off his cooking skills

B. To build a canteen

C. To celebrate the army’s victory

D. To attract more cowboys

2.What can we learn about tailgate parties?

A. They are usually held before concerts

B. They are mainly held for cowboys

C. They are also occasions to make friends

D. They are meant for football teams

3.What do people think a must for all tailgate parties?

A. Beer B. Sports

C. Music D. Vehicles with tailgates

4.What is the last paragraph mainly about?

A. The spread of tailgating

B. The popularity of jambalaya

C. Favorite foods on tailgate parties

D. Necessary equipment for tailgating

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网