填空题


【参考答案】

将affect改为effect。
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填空题
将suggest改为suggesting。
单项选择题
A．The development of balloons.B．The weather balloons.C．The history of human being flying.D．Balloons for recreation.
A．The development of balloons.
B．The weather balloons.
C．The history of human being flying.
D．Balloons for recreation.
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