单项选择题

A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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单项选择题
The international community is calling the world to pay attention to the problem to improve women’’s rights.
A．Y
B．N
C．NG
单项选择题
According to Leo Hickey of Yale University, which of the following may have spawned more advanced species of land animals
A．The barren ocean floor.
B．The Arctic.
C．The rain forest.
D．Temperate Zones.
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