单项选择题

Earth observations should provide "value added" applications from existing environmental services, property title holders and process driven financial firms, while creating greater liquidity within the corporations that use them.()

A. as
B. to
C. for
D. with

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单项选择题
I suppose the party ended in a friendly atmosphere, isn’t it()

A. don’t I
B. do I
C. did it
D. didn’t it
单项选择题
The Xinjiang Airlines serve passengers and customers in the southeast of China only.()

A. serves
B. to serve
C. serving
D. service
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