单项选择题


A．strength
B．strengths
C．strengthened
D．strong
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单项选择题
A．contemporarilyB．convenienceC．considerablyD．considerate
A．contemporarily
B．convenience
C．considerably
D．considerate
单项选择题
For whom is the author probably writing this passage
A．Train engineers.
B．General audiences.
C．Professors of statistics.
D．Young children.
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