单项选择题

A．To indicate how climbers communicated.
B．To show that climbers enjoyed many comforts.
C．To show that modern telephones work at high altitudes.
D．To emphasize how small some equipment had become.
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单项选择题
A．By writing a personal check.B．By changing them to their personal account.C．By paying in cash.D．By using a store credit card.
A．By writing a personal check.
B．By changing them to their personal account.
C．By paying in cash.
D．By using a store credit card.
单项选择题
A．Two.B．Three.C．Four.D．Five.
A．Two.
B．Three.
C．Four.
D．Five.
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