单项选择题

After speaking for three hours, the lecturer found he could scarcely talk, as he had become ______ .

A．dumb
B．inarticulate
C．hoarse
D．speechless
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单项选择题
Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved.
A．yield
B．succumb
C．subject
D．resort
单项选择题
Small children can not ______ the difference between right and wrong. It is our duty to teach them.
A．appreciate
B．enjoy
C．acknowledge
D．confess
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