单项选择题

The first ______ of the bridge is one hundred meters long.

A．preface
B．span
C．block
D．phase
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单项选择题
Smith did the only ______ thing by asking the Indians for food and shelter in their village.
A．sensitive
B．sentimental
C．sensible
D．sensational
单项选择题
______ with steam engines, turbines have much higher efficiency.
A．Compared
B．While comparing
C．Compare
D．Comparing
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