单项选择题

Like any other (constant) repeated action, speaking (has to) be learned, but once it (is learned),it becomes a generally (unconscious) and apparently automatic process.

A．constant
B．has to
C．is learned
D．unconscious
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单项选择题
Timmer is known as a touch manager who demands ______ results.
A．credible
B．undeniable
C．dynamic
D．tangible
单项选择题
Researchers at Children' s Hospital of Pittsburgh announced they had discovered ______ evidence that a virus is involved in what used to be called juvenile diabetes.
A．incessant
B．compelling
C．identical
D．problematic
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