单项选择题

Steel is an alloy composed （） of iron and carbon.

A．primarily
B．traditionally
C．carefully
D．partially

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单项选择题
The fire was finally brought under control, but not （） extensive damage had been caused.

A．after
B．before
C．since
D．as
单项选择题
A baby might show fear of an unfamihar adult, he is likely to smile and reach out to another in- fant.（）

A．if
B．whenever
C．so that
D．whereas
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