填空题

【参考答案】

revolutionized
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endangering→endangered
单项选择题
A．It’s expensive to manufacture.B．it hasn’t been adequately tested.C．It damages car engines.D．it’s dangerous to transport.
A．It’s expensive to manufacture.
B．it hasn’t been adequately tested.
C．It damages car engines.
D．it’s dangerous to transport.
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