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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单项选择题
(A paragraph) is a portion of a text (consists of) one or more (sentences) (related to) the same idea.
A．A paragraph
B．consists of
C．sentences
D．related to
单项选择题
Janson (he) was an idealist (who) refused to make any compromise (concerning) the (establishment) of the association.
A．he
B．who
C．concerning
D．establishment
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