单项选择题


A．are
B．is
C．were
D．was
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单项选择题
A．earlyB．moreC．agoD．long
A．early
B．more
C．ago
D．long
单项选择题
What is the purpose of writing these three texts
A．To make the books easier to read.
B．To show the importance of science.
C．To introduce new authors.
D．To sell the books.
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