单项选择题

A．To do comprehensive exercises.
B．To read simple sentences.
C．To copy out from the textbooks.
D．To do all of the above.
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单项选择题
A．Michael has been diving for nine years.B．Michael dives on holidays with his parents.C．Michael loves diving ever since he first tried it.D．Michael has never taken any diving courses.
A．Michael has been diving for nine years.
B．Michael dives on holidays with his parents.
C．Michael loves diving ever since he first tried it.
D．Michael has never taken any diving courses.
单项选择题
Which one is NOT mentioned in this passage that can be the source of carbon dioxide
A．Oil.
B．Trees.
C．Wood.
D．Soil.
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