D. it can help improve students' memory
答案:D 细节理解题。根据第一段确定答案。
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.
答案:C 细节理解题。根据第二段最后一句确定答案。
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.
答案:B 细节理解题。根据文章最后一段可以确定答案。
70.Which of the following statements would the writer agree with?
A.Students should be careful with gum chewing.
B.The more gums we chew, the more words we will remember.
C.Gum chewing helps change a bad eating habit.
D.The healthier gum chewing proves to be, the more we should chew.
答案:A 细节理解题。根据文章最后一段首句“So, for now, chew with caution.”和末句的“It's not a magic bullet.”可以看出作者的态度和观点。
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