[填空题] Body Systems
A body system refers to a group of organs, which are parts of the body that do a special job, such as the heart, lungs and kidneys.
Ten major body systems in the human body:
1) the skeletal system, which includes the bones and the (1) ______ (1) ______
tissues.
2) the muscle system, which plays the role of moving the body, pushing
the food through the body and making the blood (2) ______ (2) ______
3) the nervous system which is made up of the brain, the spinal
(3) ______and the nerves. (3) ______
4) the (4) ______system which comprises of the stomach and the (4) ______
intestines and (5) ______food to provide energy for the body. (5) ______
5) the respiratory system which consists of the windpipe and
(6) ______and takes air into the

[填空题] Body Systems
A body system refers to a group of organs, which are parts of the body that do a special job, such as the heart, lungs and kidneys.
Ten major body systems in the human body:
1) the skeletal system, which includes the bones and the (1) ______ (1) ______
tissues.
2) the muscle system, which plays the role of moving the body, pushing
the food through the body and making the blood (2) ______ (2) ______
3) the nervous system which is made up of the brain, the spinal
(3) ______and the nerves. (3) ______
4) the (4) ______system which comprises of the stomach and the (4) ______
intestines and (5) ______food to provide energy for the body. (5) ______
5) the respiratory system which consists of the windpipe and
(6) ______and takes air into the

[填空题]Body Systems A body system refers to a group of organs, which are parts of the body that do a special job, such as the heart, lungs and kidneys. Ten major body systems in the human body: 1) the skeletal system, which includes the bones and the (1)______ (1)______ tissues. 2) the muscle system, which plays the role of moving the body, pushing the food through the body and making the blood (2)______ (2)______ 3) the nervous system which is made up of the brain, the spinal (3)______and the nerves. (3)______ 4) the (4)______system which comprises of the stomach and the (4)______ intestines and (5)______food to provide energy for the body. (5)______ 5) the respiratory system which consists of the windpipe and (6)______and takes air into the body. (6)______ 6) the circulatory system which inc

[单项选择]The immune system is the body’s defender. It identifies, tracks down, and destroys troublemakers before they can hurt the body. Those troublemakers may be, for example, bacteria from a cut or splinter, a measles germ, a cold bug, or even a cancer cell.
These invaders try to take over our tissues and feed off our bodies’ nutrients. If they succeed, we become sick or, sometimes, even die. It’s the job of our immune systems to destroy these invaders before they destroy us.
Say you picked up a flu virus last week. Perhaps it entered your body through a cut, from a drinking glass, or from the air you breathe. Of course, you didn’t feel it, but the virus made its way into your bloodstream. As soon as it entered your body, it began to reproduce. Viruses have only one goal: to take over your cells. Once inside your body, viruses try to enter cells and disrupt their normal work. If left alone, these viruses would hurt so many cells that you would weaken, or worse, get a serious il
A. Cancer cells and transplants．
B. Thymus and lymphocytes．
C. Thymus and germs．
D. Healthy cells and hi曲blood pressur