单项选择题

A．appearance
B．framework
C．outlook
D．structure
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单项选择题
A．clerksB．guardsC．policeD．tellers
A．clerks
B．guards
C．police
D．tellers
单项选择题
(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.
A．The metal
B．has been
C．first
D．early
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