单项选择题

A．To stop using fossil fuels.
B．To reduce carbon dioxide emissions.
C．To move to colder places.
D．None of the above.
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单项选择题
A．It’’s cold and warm air is needed.B．It’’s cool enough, but an open window could make it too cold.C．It’’s hot outside, so don’’t open the window.D．It’’s nice and warm in the room.
A．It’’s cold and warm air is needed.
B．It’’s cool enough, but an open window could make it too cold.
C．It’’s hot outside, so don’’t open the window.
D．It’’s nice and warm in the room.
单项选择题
A．The echo in the church in Missouri was most unusual.B．Mark Twain’’s two friends had never heard a real echo.C．Mark Twain was taken in by his friends.D．Mark Twain knew how to tease his friends.
A．The echo in the church in Missouri was most unusual.
B．Mark Twain’’s two friends had never heard a real echo.
C．Mark Twain was taken in by his friends.
D．Mark Twain knew how to tease his friends.
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