填空题

How has the use of helicopters developed

【参考答案】

Helicopters have been used for various purp05es.
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单项选择题
A．Helpful and polite employees.B．Good food for customers.C．Clean tables and floors.D．With food ads at the entrance.
A．Helpful and polite employees.
B．Good food for customers.
C．Clean tables and floors.
D．With food ads at the entrance.
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What is a Helix
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