单项选择题


A．and
B．however
C．so
D．therefore
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单项选择题
A．emergesB．immergeC．immerseD．immense
A．emerges
B．immerge
C．immerse
D．immense
单项选择题
Which sentence best expresses the main idea of the first paragraph
A．Some students just give up on their classes.
B．One student may miss classes and then vanish.
C．The author's survey may be unscientific.
D．A positive attitude is the key to success in college.
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