单项选择题

Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

A．an easy
B．a playful
C．an open
D．a better
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单项选择题
Thailand suffers a lot due to the price slumps of its biodiesel.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Biodiesel is superior in quality to traditional petroleum.
A． Right
B． Wrong
C． Not mentioned
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