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.
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单项选择题
A．Property owned by a group of people.B．Privately-owned property.C．Government-owned property.D．People’’s joint effort to share and protect natural resources.
A．Property owned by a group of people.
B．Privately-owned property.
C．Government-owned property.
D．People’’s joint effort to share and protect natural resources.
单项选择题
A．There aren’’t enough cabinets.B．There is too much noise.C．Office supplies take up too much space.D．Some teaching assistants don’’t have desks.
A．There aren’’t enough cabinets.
B．There is too much noise.
C．Office supplies take up too much space.
D．Some teaching assistants don’’t have desks.
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