单项选择题

A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
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单项选择题
A．Because he has the idea that examinations have made the goal of exams becomes not learning, but rather the acquisition (获得) of the book knowledge.B．Because he thinks exams can increase our book knowledge.C．Because he thinks exams are completely useless.D．Because the examination system has lasted too long in history.
A．Because he has the idea that examinations have made the goal of exams becomes not learning, but rather the acquisition (获得) of the book knowledge.
B．Because he thinks exams can increase our book knowledge.
C．Because he thinks exams are completely useless.
D．Because the examination system has lasted too long in history.
填空题
Singapore and Yokohama maintain their business centres near the ______.
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