单项选择题

Mathematics is still the necessary （） for the management of nature.

A．implement
B．implication
C．illustration
D．appliance

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单项选择题
The development of (new building materials) and mass-production techniques (brought) significant changes (to architecture) in the first quarter of (the twentieth century).（）

A．new building materials
B．brought
C．to architecture
D．the twentieth century
单项选择题
He (was) (born) in a (small) village in (the year) 1970.（）

A．was
B．born
C．small
D．the year
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