When you do exercises, your heart works better. It is able to______ more blood while beating more slowly.
A. produce B. pump C. increase D. bump
When you do exercises, your heart works better. It is able to______ more blood while beating more slowly.
A. produce B. pump C. increase D. bump
B
“泵入更多的血”。
A. “产生”；C. “增加”；D. “碰，撞”。