Page 93-95 Part 6 Paragraph C6. What main idea is the writer implying?
A: All chemical reactions require oxygen.
B: Oxygen is vital to human life.
C: Less than a fourth of the air we breathe is oxygen.
D: The respiratory system and the cardiovascular system work together.
A: All chemical reactions require oxygen.
B: Oxygen is vital to human life.
C: Less than a fourth of the air we breathe is oxygen.
D: The respiratory system and the cardiovascular system work together.
举一反三
- Page 93-95 Part 6 Paragraph C7. Which one of the following details does not support the paragraph’s implied main idea? A: All the nutrients in the world are useless to humans. B: The chemical reactions that release energy from foods use oxygen. C: Oxygen is an important component of the air we breathe. D: The respiratory and cardiovascular systems supply oxygen to the blood and body cells.
- 往下猛拉氧气面罩让他开始充气。 A: Pull the oxygen mask with a continuous movement to start the flow of oxygen. B: Pull the oxygen mask with a gentle movement to start the flow of oxygen. C: Pull the oxygen mask with a sudden movement to start the flow of oxygen.
- 突然拉下氧气面罩，启动氧气流动 A: Pull the oxygen mask with a sudden movement to start the flow of oxygen. B: Jerk the oxygen mask to start the flow of oxygen.
- Page 93-95 Part 6 Paragraph A2. What main idea is the writer implying? A: S. presidents all enjoy being in the public eye. B: The successors of President Kennedy have tried to imitate him. C: Presidents have placed increasing importance on making public appearances. D: Presidents spend too much time making public appearances.
- Almost all bio-film system work well for de-nitrification, as long as oxygen transfer can be kept to a minimum and plugging does not occur. ( )