单项选择题

While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.

A．occasionally
B．simultaneously
C．eventually
D．promptly
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单项选择题
The non-verbal communication ______.
A．always expresses the message efficiently
B．shows the speaker’s true emotions
C．isolates a meaning
D．usually does not match the language
单项选择题
Without the friction between their feet and the ground, people would ______ be able to walk.
A．in no time
B．by all means
C．in no way
D．on any account
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