People who breathe infected air from a TB patient can become infected with the tuberculosis（肺结核） bacteria（细菌）. However, most people with active tuberculosis do not expel （驱逐，逐出）very many TB bacteria. So, the spread of the disease usually does not happen unless a person spends a large amount of time with a TB patient. Those most at risk are family members, friends and people who live or work closely with a patient.

Tuberculosis can attack any part of the body. However, the lungs are the most common targets（目标） of the bacteria. People with the disease show several signs. They may expel air from the lungs suddenly with an explosive（爆炸性的） noise. This kind of cough continues for a long period of time. People with a more severe case of tuberculosis also may cough up blood.

People with the disease often have high body temperatures. They suffer what are called night sweats, during which their bodies release large amounts of water through the skin. TB victims also are tired all the time. They are not interested in eating. So their bodies lose weight.

One thing that is especially dangerous about TB is that people with moderate（中等的） signs of the disease may not know they have had it. They may spread the disease to others without even knowing it. So, it is very important for people to get tested for tuberculosis.

The spread of the TB is through__________.

A、food        B、air         C、clothes          D、touching

Family members are those most at risk to be infected with the tuberculosis bacteria,_____________.

A、because they have the same bath room  B、because they have blood relationship

C、because they love each other very much  D、because they live in the same room

The common signs of TB are ___________.

A、cough or even cough with blood, night sweat, and tired of sleeping.

B、cough or even cough with blood, night sweat, and eating too much

C、cough, fever, feeling tired, night sweat, losing weight

D、cough, fever, feeling tired, night sweat, eating too much

Why may some TB patients spread the disease to others without even knowing it?

A、Because there is no sign in the early stage of the disease.

B、Because these patients don’t show any signs of the disease.

C、Because these patients’ signs of the disease are too weak to be noticed.

D、Because these patients don’t know how the disease spreads between people.

Alan Izhar-Bodner, an Israeli inventor, has developed a swimming suit for divers to breathe underwater without carrying heavy oxygen tanks. His suit makes use of the air that is dissolved（溶解）in water, just like fish do.
The system uses the Henry Law which states that the amount of gas that can be dissolved in a liquid is proportional (成比例的)to the pressure on the liquid. Raise the pressure ---more gas can be dissolved in the liquid. Decrease the pressure --- less gas dissolved in the liquid releases the gas. This is exactly what happens when you open a can of soda; carbon dioxide gas is dissolved in the liquid and is under pressure in the can. Open the can, releasing the pressure, and the gas fizzes(嘶撕作响)out.
Bodner's System obviously uses a special machine to lower pressure in part of a small amount of seawater taken into the system; dissolved gas is taken out. The patent（专利）reads: A self-contained open-circuit（循环）breathing instrument for use within a body of water naturally containing dissolved air. The instrument is adapted to provide breathable(可吸入的)air. The instrument contains an inlet for taking out a quantity of water from the body of water. It further contains a separator for separating the dissolved air from the quantity of water, thus gaining the breathable air. The instrument further contains an outlet for expelling (驱逐)the separated water back into the body of water, and another outlet for removing the breathable air and supplying it for breathing. The air is supplied so as to enable it to be expelled back into the body of water after it has been breathed .   
Human beings have been thinking about how to breathe underwater since they started swimming. This long-held desire plays an important part in one of the first great science fiction novels, Jules Verne's 20,000 Leagues Under the Sea.
【小题1】It can be inferred from the passage that____________ .

Alan Izhar-Bodner, an Israeli inventor, has developed a swimming suit for divers to breathe underwater without carrying heavy oxygen tanks. His suit makes use of the air that is dissolved（溶解）in water, just like fish do.

The system uses the Henry Law which states that the amount of gas that can be dissolved in a liquid is proportional (成比例的)to the pressure on the liquid. Raise the pressure ---more gas can be dissolved in the liquid. Decrease the pressure --- less gas dissolved in the liquid releases the gas. This is exactly what happens when you open a can of soda; carbon dioxide gas is dissolved in the liquid and is under pressure in the can. Open the can, releasing the pressure, and the gas fizzes(嘶撕作响)out.

Bodner's System obviously uses a special machine to lower pressure in part of a small amount of seawater taken into the system; dissolved gas is taken out. The patent（专利）reads: A self-contained open-circuit（循环）breathing instrument for use within a body of water naturally containing dissolved air. The instrument is adapted to provide breathable(可吸入的)air. The instrument contains an inlet for taking out a quantity of water from the body of water. It further contains a separator for separating the dissolved air from the quantity of water, thus gaining the breathable air. The instrument further contains an outlet for expelling (驱逐)the separated water back into the body of water, and another outlet for removing the breathable air and supplying it for breathing. The air is supplied so as to enable it to be expelled back into the body of water after it has been breathed .   

Human beings have been thinking about how to breathe underwater since they started swimming. This long-held desire plays an important part in one of the first great science fiction novels, Jules Verne's 20,000 Leagues Under the Sea.

1.It can be inferred from the passage that____________ .

A．the less pressure it is, the less carbon dioxide gas is dissolved in the liquid

B．the deeper one dives into the ocean, the less gas is dissolved in the water

C．the greater pressure it is, the more carbon dioxide gas is dissolved in the liquid

D．the deeper one dives into the ocean, the more gas is dissolved in the water

2.This passage is mainly about __________.

A．how Bodner invented the instrument for breathing underwater

B．why Bodner invented the instrument for breathing underwater

C．how Bodner's instrument for breathing underwater works

D．how Bodner's instrument is used by divers for breathing underwater

3.From the passage we learn that __________.

A．a separator is used to expel breathable air back into the body of water

B．a separator is used to separate the air from the water so as to make use of the water

C．The breathable air removed from an outlet will eventually go back to the body of water.

D．The breathable air removed from an outlet will immediately go back to the body of water.

Alan Izhar-Bodner, an Israeli inventor, has developed a swimming suit for divers to breathe underwater without carrying heavy oxygen tanks. His suit makes use of the air that is dissolved（溶解）in water, just like fish do.
The system uses the Henry Law which states that the amount of gas that can be dissolved in a liquid is proportional (成比例的)to the pressure on the liquid. Raise the pressure ---more gas can be dissolved in the liquid. Decrease the pressure --- less gas dissolved in the liquid releases the gas. This is exactly what happens when you open a can of soda; carbon dioxide gas is dissolved in the liquid and is under pressure in the can. Open the can, releasing the pressure, and the gas fizzes(嘶撕作响)out.
Bodner's System obviously uses a special machine to lower pressure in part of a small amount of seawater taken into the system; dissolved gas is taken out. The patent（专利）reads: A self-contained open-circuit（循环）breathing instrument for use within a body of water naturally containing dissolved air. The instrument is adapted to provide breathable(可吸入的)air. The instrument contains an inlet for taking out a quantity of water from the body of water. It further contains a separator for separating the dissolved air from the quantity of water, thus gaining the breathable air. The instrument further contains an outlet for expelling (驱逐)the separated water back into the body of water, and another outlet for removing the breathable air and supplying it for breathing. The air is supplied so as to enable it to be expelled back into the body of water after it has been breathed .   
Human beings have been thinking about how to breathe underwater since they started swimming. This long-held desire plays an important part in one of the first great science fiction novels, Jules Verne's 20,000 Leagues Under the Sea

1. 1.

   It can be inferred from the passage that____________

   1. A.
      the less pressure it is, the less carbon dioxide gas is dissolved in the liquid
   2. B.
      the deeper one dives into the ocean, the less gas is dissolved in the water
   3. C.
      the greater pressure it is, the more carbon dioxide gas is dissolved in the liquid
   4. D.
      the deeper one dives into the ocean, the more gas is dissolved in the water
2. 2.

   This passage is mainly about __________

   1. A.
      how Bodner invented the instrument for breathing underwater
   2. B.
      why Bodner invented the instrument for breathing underwater
   3. C.
      how Bodner's instrument for breathing underwater works
   4. D.
      how Bodner's instrument is used by divers for breathing underwater
3. 3.

   From the passage we learn that __________

   1. A.
      a separator is used to expel breathable air back into the body of water
   2. B.
      a separator is used to separate the air from the water so as to make use of the water
   3. C.
      The breathable air removed from an outlet will eventually go back to the body of water
   4. D.
      The breathable air removed from an outlet will immediately go back to the body of water