单项选择题

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
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单项选择题
A．To learn the chemical elements in the Ice Age for the last ten thousand years.B．To learn the pattern of solar wind activity for the last ten thousand years.C．To learn the composition of different trees for the last ten thousand years.D．To learn what’’s being happening on the sun’’s surface for the last ten thousand years.
A．To learn the chemical elements in the Ice Age for the last ten thousand years.
B．To learn the pattern of solar wind activity for the last ten thousand years.
C．To learn the composition of different trees for the last ten thousand years.
D．To learn what’’s being happening on the sun’’s surface for the last ten thousand years.
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.
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