单项选择题

As steel plants have become more ______, maintenance and adjustments of equipment have become a large share of the cost of running the plants.

A．allied
B．drafted
C．automated
D．duplicated
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单项选择题
Rumors are everywhere, spreading fear, damaging reputations, and turning calm situations into ones.
A．tragic
B．turbulent
C．vulnerable
D．suspicious
单项选择题
How did man manage to survive the black cloud in the tropics
A．They hid in caves and cellars.
B．They tried to reduce the temperature.
C．They killed 7943 species of plants and animals.
D．They ate ice so that the body temperature was reduced.
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