填空题

It’s difficult to get ahead but ______ (要保持领先就更难).

【参考答案】

more difficult to remain ahead
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填空题
The local health organization is reported ______ (三十年前成立的) when Mr. Smith became its first mayor.
单项选择题
A．ratesB．ratiosC．proportionsD．percentages
A．rates
B．ratios
C．proportions
D．percentages
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