单项选择题

One criticism against many international airlines is that they have, in the recent past, ______.

A．catered for the more wealthy people
B．given preferential treatment to executive clients
C．only met the needs of the regular travelers
D．marketed their service with the masses in mind

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单项选择题

With the intention of attracting a somewhat different type of passengers, the airlines have now begun to concentrate on ______.

A．providing facilities enabling business travelers to work on board
B．ensuring that the facilities offered to the executive are indeed superior
C．organizing activities in which first-class passengers can participate
D．installing sleeping compartments where more privacy is ensured

单项选择题

The Neanderthals have larger housing brains than modem human beings because ______.

A．their intelligence is more advanced
B．they are much shorter
C．their bodies are larger
D．they are larger and cleverer