单项选择题

(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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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 in
C．their
D．bottom lands
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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