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．Philip has not been to this part of the library before.B．It was very quiet in the library.C．Philip fell off the ladder and made a loud noise.D．The librarian was very kind to readers.
A．Philip has not been to this part of the library before.
B．It was very quiet in the library.
C．Philip fell off the ladder and made a loud noise.
D．The librarian was very kind to readers.
填空题
In the past, the global average temperature may have been 27℃.
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