单项选择题

The directions were so ______ that it was impossible to complete the assignment.

A．ingenious
B．ambitious
C．notorious
D．'ambiguous
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单项选择题
It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.
A．adjustment
B．supply
C．assurance
D．provision
单项选择题
Without the friction between their feet and the ground, people would ______ be able to walk.
A．in no way
B．on any account
C．by all means
D．in no time
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