单项选择题

Questions 28 to 30 are based on the passage you have just heard.

A．They can easily catch fire.
B．They can be easily operated.
C．They are not as safe as gas balloons.
D．They cost too much money.
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单项选择题
A．Tidy.B．Messy.C．Well-made.D．Bright.
A．Tidy.
B．Messy.
C．Well-made.
D．Bright.
单项选择题
A．How to count numbers.B．How to read and write.C．How to move objects.D．How to hunt and farm.
A．How to count numbers.
B．How to read and write.
C．How to move objects.
D．How to hunt and farm.
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