单项选择题

A．Sunlight.
B．Heat waves.
C．Natural disaster.
D．Low nighttime temperature.
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单项选择题
We can learn from the passage that ethanol is （）.

A．a renewable fuel
B．a biofuel
C．produced from corn
D．all the above
单项选择题
A．Their writings are redundant. B．Their sentences are too short. C．Their sentences are not beautiful. D．The main idea is too simple.
A．Their writings are redundant.
B．Their sentences are too short.
C．Their sentences are not beautiful.
D．The main idea is too simple.
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