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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In 1968, Amy became (one of) the American (women) (received) the Nobel Prize (for) literature.
A．one of
B．women
C．received
D．for
单项选择题
I (would rather) you (don't) (make any comment) (on) this problem.
A．would rather
B．don't
C．make any comment
D．on
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