单项选择题

Which of the following may lead to family quarrels according to the passage（）

A．Nawareness of energy cycles.
B．Familiar monologues.
C．A change in a family member's energy cycle.
D．Attempts to control the energy cycle of other family members.

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单项选择题

You are advised to rise with a yawn and stretch because it will（）

A．help to keep your energy for the day's work
B．help you to control your temper early in the day
C．enable you to concentrate on your routine work
D．keep your energy cycle under control all day

单项选择题

The elapsed time of the fastest transatlantic crossing mentioned by the author was 13 days and （）

A．11.5 hours
B．7.5 hours
C．7 hours
D．4.5 hours