单项选择题

A．decades
B．centuries
C．dozens
D．years
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单项选择题
A．accumulationB．developmentC．knowledgeD．rate
A．accumulation
B．development
C．knowledge
D．rate
单项选择题
What’s the main topic of this passage
A．The tests of new airliner before its flying.
B．How to protect a new airliner
C．How to train a new pilot
D．What the airliner engineers should do
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