（ ） acts as a pump to maintain a constant circulation to blood throughout the body.
A: heart
B: kidneys
C: lungs
D: liver
A: heart
B: kidneys
C: lungs
D: liver
举一反三
- The heart is an important organ of circulation ________ function is to pump blood to all parts of the body.
- 12.The function of the cardiovascular<br/>system is to transport blood throughout the body, with the heart acting as the pump for ________. A: circulation B: transportation C: transplant D: operation
- 29. The heart is an important organ of circulation ________ function is to pump blood to all parts of the body. A: which B: whose C: of it D: its
- The ________ of the heart is to pump blood through the body.
- If the _______ stops beating, no blood can flow through the body.() A: heart B: lungs