单项选择题

A．How birds’ nests have evolved.
B．Why some birds’ nests am considered primitive.
C．How birds learn to build nests.
D．Why birds lay eggs.
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单项选择题
A．Searching for reference material.B．Watching a film of the 1930s’.C．Writing a course book.D．Looking for a job in a movie studio.
A．Searching for reference material.
B．Watching a film of the 1930s’.
C．Writing a course book.
D．Looking for a job in a movie studio.
填空题
Natural gas trapped in underground reservoirs is extracted by ______.
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