单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．The construction of the American space station.
B．Budget problems.
C．Delays.
D．Technical difficulties.
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单项选择题
A．A big noise.B．A strange noise.C．A stranger’s noise.D．A child’s noise.
A．A big noise.
B．A strange noise.
C．A stranger’s noise.
D．A child’s noise.
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