单项选择题

In the (nineteenth) century, people (lived) in the northern area grew (their) crops on river (bottom lands).

A．nineteenth
B．lived
C．their
D．bottom lands
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(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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(A paragraph) is a portion of a text (consists of) one or more (sentences) (related to) the same ide
A． A paragraphB. consists ofC. sentencesD. related to
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