单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．We should blame external factors.
B．We should blame others.
C．We should blame internal factors.
D．We needn’t blame ourselves.
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单项选择题
A．Lightning and thunder.B．A great deal of water vapor and a rapidly rising air current.C．Warm air and cold air.D．A great amount of vapor and electricity.
A．Lightning and thunder.
B．A great deal of water vapor and a rapidly rising air current.
C．Warm air and cold air.
D．A great amount of vapor and electricity.
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