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单项选择题

A．How people improve their memory effectively.
B．The role that caffeine plays in improving memory.
C．The relationship between caffeine and health.
D．How caffeine influences people"s moods.
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热门试题

单项选择题A．Yet to be determined.B．Bad weather.C．Dangerous settlements.D．Lack of timely rescue operations.

A．Yet to be determined.
B．Bad weather.
C．Dangerous settlements.
D．Lack of timely rescue operations.

单项选择题A．It washed away three villages in the eastern Uganda.B．It claimed at least 260 villagers lives.C．It killed a handful of rescue workers.D．It resulted in the disappearance of over 86 people.

A．It washed away three villages in the eastern Uganda.
B．It claimed at least 260 villagers" lives.
C．It killed a handful of rescue workers.
D．It resulted in the disappearance of over 86 people.