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【参考答案】

maximum efficiency/highest efficiency
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单项选择题
A．Guinness developed it by himself.B．Sir Hugh Beaver first asked Mcwhirter twins to develop it.C．It first developed in Ireland.D．Somebody called Guinness developed it.
A．Guinness developed it by himself.
B．Sir Hugh Beaver first asked Mcwhirter twins to develop it.
C．It first developed in Ireland.
D．Somebody called Guinness developed it.
单项选择题
A．earthquakeB．hurricaneC．fireD．terrorist attack
A．earthquake
B．hurricane
C．fire
D．terrorist attack
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