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.
单项选择题
A．She smashed her front tooth in her childhood and the dentist put in a beautiful one.B．Her childhood experience was so horrible that she made up her mind to help those with bad teeth.C．She liked to be dentist without any particular reasons.D．She fell in love with a dentist.
A．She smashed her front tooth in her childhood and the dentist put in a beautiful one.
B．Her childhood experience was so horrible that she made up her mind to help those with bad teeth.
C．She liked to be dentist without any particular reasons.
D．She fell in love with a dentist.
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