单项选择题

_________ that of iron construction, the technology for constructing building with reinforced concrete developed rather rapidly.

A．Dissimilar
B．Different
C．Not likely
D．Unlike
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单项选择题
All the lights in the house are _________ in the draught from the opening window.
A．floating
B．fluttering
C．wavering
D．flickering
单项选择题
_________ the rhinoceros is carefully protected, it will soon go the way of other extinct spe- cies.
A．If
B．Therefore
C．As long as
D．Unless
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