单项选择题


A．convert
B．transform
C．alter
D．vary
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单项选择题
Japan's trading partners' attitude towards its growing trade surplus can be described as ______ .
A．angry
B．indifferent
C．overjoyed
D．worried
单项选择题
The stone chip is thought to be the most important tool because it _______.
A．was one of the first tools
B．developed human capabilities
C．led to the invention of machines
D．was crucial to the development of mankind
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