单项选择题

Colonial efforts (to manufacture) glass at Jamestown--and (later attempts) near Philadelphia and Boston--failed despite the (abundant) of fuel and good raw (materials).

A．to manufacture
B．later attempts
C．abundant
D．materials
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单项选择题
Three fundamental aspects of (forest conversation) are the protection of immature trees, the use (of proper) harvesting methods, and (provide) for an environment (that supports) reproduction.
A．forest conversation
B．of proper
C．provide
D．that supports
单项选择题
The first fiction (writer) in the United States to (achieve) international (fame) was Washington Irving, who wrote many stories, (included) Rip Van Winkle' and The Legend of Sleepy Hollow'.
A．writer
B．achieve
C．fame
D．included
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