As a physician who travels quite a lot, I spend a lot of time on planes listening for that dreaded “Is there a doctor on board?” announcement. I’ve been   16  only once — for a woman who had merely fainted. But the   17  made me quite curious about how   18  this kind of thing happens. I wondered what I would do if   19  with a real midair medical emergency — without access   20  a hospital staff and the usual emergency equipment. So   21  the New England Journal of Medicine last week   22  a study about in-flight medical events, I read it   23  interest.
　　The study estimated that there are a(n)   24  of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not   25 ; fainting and dizziness are the most frequent complaints.  26  13% of them — roughly four a day — are serious enough to   27  a pilot to change course. The most common of the serious emergencies   28  heart trouble, strokes, and difficulty breathing.
　　Let’s face it: plane rides are   29 . For starters, cabin pressures at high altitudes are set at roughly      30  they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty   31 , but passengers with heart disease   32  experience chest pains as a result of the reduced amount of oxygen flowing through their blood.   33  common in-flight problem is deep venous thrombosis — the so-called economy class syndrome (综合症).   34  happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent legislation (立法), flights with at      35  one attendant are starting to install emergency medical kits to treat heart attacks.

As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without many living things.

   Pollution in water is not simply a matter of “poisons” killing large numbers of fish overnight. Very often the effects of pollution are not noticed for many months or years because the first organisms (生物体) to be affected are either plants or plankton (浮游生物). These organisms are the food of fish, birds, and other creatures. When this food disappears, the fish and birds die too. In this way a whole food chain can be wiped out, and it is not until dead fish and water birds are seen at the river’s edge or on the sea shore that people realize what is happening.

   Where do the substances which pollute water come from? There are two main sources, sewage(污水) and industrial waste. As more detergent (洗涤剂)is used in homes, more of it is finally put into our rivers, lakes and seas.  Detergents harm water birds by breaking down the natural substances which keep their feathers waterproof. Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are many highly poisonous materials in it, such as copper and lead.

   So if we want to stop this pollution, the answer is simple. Sewage and industrial waste must be made clean before flowing into the water reservoirs. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

1.Pollution in water is noticed ________.

A. when the first organisms are affected

B. when many fish and birds die   

C. when poisons are poured into water

D. As soon as the balance of nature is destroyed

2.Living things die in a lake or river because there is no ________.

A. water         B. fish                   C. Poison               D. oxygen

3.The underlined word “waterproof” in the third paragraph means “          ”.

A. full of water   B. not allowing water to go through

C. covered with water   D. cleaned by water

4.Which of the following things is /are harmful according to the passage？

A. Industrial waste and chemicals    B. Water in the river

C. Coal and wood  D. plastic

As a physician who travels quite a lot, I spend a lot of time on planes listening for that dreaded “Is there a doctor on board?” announcement. I’ve been   16  only once — for a woman who had merely fainted. But the   17  made me quite curious about how   18  this kind of thing happens. I wondered what I would do if   19  with a real midair medical emergency — without access   20  a hospital staff and the usual emergency equipment. So   21  the New England Journal of Medicine last week   22  a study about in-flight medical events, I read it   23  interest.

　　The study estimated that there are a(n)   24  of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not   25 ; fainting and dizziness are the most frequent complaints.  26  13% of them — roughly four a day — are serious enough to   27  a pilot to change course. The most common of the serious emergencies   28  heart trouble, strokes, and difficulty breathing.

　　Let’s face it: plane rides are   29 . For starters, cabin pressures at high altitudes are set at roughly      30  they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty   31 , but passengers with heart disease   32  experience chest pains as a result of the reduced amount of oxygen flowing through their blood.   33  common in-flight problem is deep venous thrombosis — the so-called economy class syndrome (综合症).   34  happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent legislation (立法), flights with at      35  one attendant are starting to install emergency medical kits to treat heart attacks.

As a boy，Tim was much influenced by books about the sea, but in fact by the age of fifteen he had decided to become a doctor rather than a sailor. His father was a dentist and as a result Tim had the opportunity of meeting many doctors either at home or elsewhere. When he was fourteen he was already hanging around the clinic of a local doctor where he was supposed to be helping to wrap up medicine bottles，but was actually trying to listen to the conversations taking place between the doctor and his patients in the next room.

During the war Tim served in the Navy as a surgeon（外科医生）.“That was the happiest time of my life. I was dealing with very real suffering and on the whole making a success of it .”In California he taught the country people simple facts about medicine. He saw himself as a life-saver. He had proved his skills to himself and his ability to take decisions. Thus，while he was able to tell them what to do, he could feel he was serving them. After the war, he got married and chose to be a doctor in the countryside，working under an old doctor who was popular in the area，but who hated the sight of blood and believed that the secret of medicine was faith. This gave the younger man many opportunities to go on working as a life –saver.

1.Tim decided to become a doctor at fifteen mainly because      

2.Which of the following is true according to the passage?

3.From the passage we can infer that Tim        .

4.The passage is mainly about        .

As a boy，Tim was much influenced by books about the sea, but in fact by the age of fifteen he had decided to become a doctor rather than a sailor. His father was a dentist and as a result Tim had the opportunity of meeting many doctors either at home or elsewhere. When he was fourteen he was already hanging around the clinic of a local doctor where he was supposed to be helping to wrap up medicine bottles，but was actually trying to listen to the conversations taking place between the doctor and his patients in the next room.

      During the war Tim served in the Navy as a surgeon（外科医生）.“That was the happiest time of my life. I was dealing with very real suffering and on the whole making a success of it .”In California he taught the country people simple facts about medicine. He saw himself as a life-saver. He had proved his skills to himself and his ability to take decisions. Thus ，while he was able to tell them what to do ， he could feel he was serving them. After the war ，he got married and chose to be a doctor in the countryside，working under an old doctor who was popular in the area， but who hated the sight of blood and believed that the secret of medicine was faith. This gave the younger man many opportunities to go on working as a life –saver.

1．Tim decided to become a doctor at fifteen mainly because       .

      A．his father wanted him to be so

      B．his father was a surgeon himself

      C．he had read many books about medicine

      D．he had chances to the old doctors through his father

2．Which of the following is true according to the passage?

      A．Tim got married to the old doctor’s daughter.

      B．Tim continued working as a surgeon after the war.

      C．Before the war，Tim worked as a doctor at a local clinic.

      D．While working in California，Tim taught life-saving to the patients.

3．From the passage we can infer that Tim        .

      A．was sent to Europe during the war

      B．worked as a surgeon during the war

      C．was not afraid of seeing blood

      D．decided to give up medicine for faith

4．The passage is mainly about        .

      A．Tim’s life story       B．Tim’s dreams      C．Tim’s marriage      D．Tim’ s patients