Medical experts say carbon monoxide affects people differently. For example, a small child will experience health problems or die much quicker than an adult will. The general health of the person or his or her age can also be important. An older adult with health problems may suffer the effects of carbon monoxide more quickly than a younger person with no health problems. People with heart disease may suffer chest pains. They may begin to have trouble breathing.

　　21．Why is carbon monoxide called the silent killer?

　　A．Because it tastes and smells good.

　　B．Because it is not easily noticed.

　　C．Because it kills and injures people.

　　D．Because it always harms people.

　　22．How does carbon monoxide harm people?

　　A．It makes people's blood unable to move.

　　B．It decreases the amount of blood in the body.

　　C．It makes body tissues full of blood.

　　D．It makes the blood less able to carry oxygen.

　　23．When people breathe in small amounts of the gas, they may ________.

　　A．feel a little dizzy

　　B．suffer a severe headache

　　C．go around in the room

　　D．have a terrible stomach ache

　　24．Which of the following about carbon monoxide poisoning is TRUE?

　　A．Adults are affected more seriously than children.

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