单项选择题

The passage focuses on ______.

A．construction and manufacturing industry in the United States
B．new technique of obtaining aluminum from poor ores
C．consumption and production of aluminum in the United States
D．the annual import of high-grade aluminum into the United States

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单项选择题

According to the announcement which of the following is true of special summer hours for the library

A．It has them only on the weekends.
B．It has them both weekdays and weekends.
C．It has no special summer hours.
D．The information is not availabl

单项选择题

Times for movies and concerts are not listed in this announcement because ______.

A．film or concert occurs every Wednesday at 7 p. m.
B．the full list would be too long
C．films and concerts cannot be announced publicly
D．the full list is not ready yet