单项选择题

An transport industry is an area of commerce in which aircraft are employed to carry passengers, freight and mail（）

A.空中运输业是一种以雇佣飞机来输送乘客，货物和信件的一种商业贸易。
B.空运业是商业的一个领域，它就是用飞机运送乘客，货物及邮件。
C.空运业务是贸易领域的一项业务，它可以用飞机来载人，运货物和邮件。
D.航空运输业是一个商业领域，在这个领域中用飞机运送旅客，货物和邮件。

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What is the effective solution to prevent death from drowningTo teach the babies to（）.

单项选择题

According to the passage, when does a trade imbalance occur When（）.

A．a country has serious economic problem
B．a country sells more products overseas than it imports
C．the value of the products a country imports is greater than the value of the product it exports
D．a country can’t develop its natural resources