单项选择题

A person's calorie requirements vary ______ his life.

A．across
B．throughout
C．over
D．within

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单项选择题

American football and baseball are becoming known to the British public through televised ______ from the United States.

A．transfer
B．deliveries
C．transportation
D．transmissions

单项选择题

All the key words in the article are printed in ______ type so as to attract readers' attention.

A．dark
B．dense
C．black
D．bold

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