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
_________ , Shirley thought Carol's husband was ill, but later she realized he wasn't.
A．First
B．At first
C．Firstly
D．First of all
单项选择题
The building casts a large _________ on the ground.
A．shadow
B．shade
C．shampoo
D．shawl
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