阅读理解。
The average adult has about five litres of blood living inside of their body, flowing through their vessels
(血管), delivering essential elements, and removing harmful wastes. Without blood, the human body would
stop working.
Blood is the fluid of life, transporting oxygen from the lungs to body tissue and carbon dioxide from body
tissue to the lungs. Blood is the fluid of growth, transporting nourishment from digestion and hormones from
glands (腺) throughout the body. Blood is the fluid of health, transporting disease fighting substances to the
tissue and waste to the kidneys (肾脏).
Because it contains living cells, blood is alive. Red blood cells and white blood cells are responsible for
nourishing and cleansing the body. Since the cells are alive, they too need nourishment. Vitamins and Minerals
keep the blood healthy. The blood cells have a definite life cycle, just as all living organisms do.
About 55 percent of blood is plasma (血浆), a straw-coloured clear liquid. The liquid plasma carries the
solid cells and the platelets (血小板), which help blood clot. Without blood platelets, you would bleed to death.
When the human body loses a little bit of blood through a minor wound, the platelets cause the blood to
clot so that the bleeding stops. Because new blood is always being made inside of your bones, the body can
replace the lost blood. When the human body loses a lot of blood through a major wound, that blood has to
be replaced through a blood transfusion from other people.
But everybody's blood is not the same. There are four different blood types. Plus, your blood has Rh
factors, which make it even more unique. Blood received through a transfusion must match your own.
Patients who are scheduled to have major surgery make autologous blood donations (donations of their own
blood) so that they have a perfect match.
1. The blood can do the following except ____.
A. deliver essential elements for the body
B. remove harmful wastes from the body
C. absorb oxygen from the air to body tissue
D. move carbon dioxide from body tissue to the lungs
2. Which of the following is the least related to blood's role?
A. Life.
B. Growth.
C. Health.
D. Waste.
3. What is the function of the liquid plasma?
A. It is a straw-coloured clear liquid.
B. It carries the solid cells and the platelets.
C. It gives the blood cells a definite life cycle.
D. It helps the blood clot so that the bleeding stops.
