Nowadays airports provide all kinds of services 查看材料
A. in the development of air transportation
B. the earliest passenger flights were successfully operated
C. to make travel easy and pleasant for the passengers
D. to provide different services
E. the shortage of qualified pilots
F. traveling by air was very cheap
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请在第__（52）__处填上正确答案。 查看材料
A. as many as
B. as well as
C. as soon as
D. as much as
For poorer countries to crack down on counterfeiting__________．
A. more jobs have to be created there for local people
B. rich countries resort to both persuasion and threats
C. the World Trade Organization was set up
D. the Uruguay round of world trade talks was held in l994
成人糖尿病饮食中糖类产热比应为
A. 15％±
B. 50％～60％
C. 20％～25％
D. <90％
E. >30％
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