So, for now, chew with caution. Too much chewing can damage the jaw joint. And chewing too much of a gum that contains vitamins, caffeine, or a medicine could lead to an overdose(过量). What’s more, no matter how healthy gum chewing proves to be, it will never be a match for a healthy lifestyle. Nothing like a gum or a vitamin is going to cure a bad eating habit or a bad exercise habit. It’s not a magic bullet.
67. Scientific studies about gum chewing show that ______ .
A. it can help fight serious diseases
B. it can help blood produce more oxygen
C. it can help reduce headaches
D. it can help improve students’ memory
68. Why are scientists trying to put different substances in gum?
A. To make it taste more delicious.
B. To make it contain more ingredients.
C. To help cure different illnesses.
D. To help improve the sales of gum.
69. What does the writer think of the results of the present studies about gum?
A. The writer has no doubt about them.
B. The writer isn’t quite sure about them.
C. The writer doesn’t believe them at all.
D. The writer is very happy with them.
70. Which of the following statements would the writer agree with?
A. Students should be careful with gum chewing.
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