单项选择题
A. the air will be too thin to support its wings B. the air will become thicker C. the air will exert pressure on it D. the air will disappear in no time
A. encourage trade in the region B. crack down on drug smuggling C. save the declining fishing industry D. strengthen cross-boarder police presence
A. The document will cover the next two decades. B. The document will win support from the delegates. C. The document will serve as a guideline. D. The document will be completed after the conference.