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A. He travelled with his parents. B. He travelled with his best friends.
C. He travelled with his American friends.
D. He travelled with a friend and one American and some people from Switzerland.
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单项选择题A. One scientist. B. One coffee farmer. C. One former Starbucks employee. D. One worker in the coffee company.

A. One scientist.
B. One coffee farmer.
C. One former Starbucks employee.
D. One worker in the coffee company.

单项选择题A. There is no need to include sex in medical research. B. Sex should be taken into account in medical research. C. Sex will sometimes affect the medical research results. D. Different sexes do not influence the medical research results.

A. There is no need to include sex in medical research.
B. Sex should be taken into account in medical research.
C. Sex will sometimes affect the medical research results.
D. Different sexes do not influence the medical research results.