Since 1939, numerous scientific studies ______.
A: proved smoking causes fatal diseases
B: proved smoking causes life-shorting diseases
C: proved smoking is a health risk
D: had been made to prove whether smoking causes life shorting
A: proved smoking causes fatal diseases
B: proved smoking causes life-shorting diseases
C: proved smoking is a health risk
D: had been made to prove whether smoking causes life shorting
举一反三
- As smoking ____health, you'd better give it up. A: affects B: causes C: effects D: influences
- Smoking and ________ is risk factor that leads to various diseases. It has become world’s top 8 causes of death.
- Habits acquired in youth-notably smoking and drinking-may increase the risk of ________ diseases in a person’s later life.
- Some people believe that smoking may （） one’s life—not only cancer, but also heart and lung diseases are related with smoking. (short)
- Since Lisa gave up smoking, her life has made great changes. Here are two examples: ______ ,______