填空题


【参考答案】

optimist→optimism
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divorce→divorced
单项选择题
A．Mining is difficult.B．It costs a lot of money to preserve.C．They are difficult to be processed.D．They are non-renewable.
A．Mining is difficult.
B．It costs a lot of money to preserve.
C．They are difficult to be processed.
D．They are non-renewable.
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