单项选择题

Steel works are encouraged to purchase ______ iron so as to reduce the consumption of natural resources.

A．scrap
B．scrape
C．scratch
D．snap
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单项选择题
International students in China usually have a hard time writing Chinese characters of numerous ______.
A．strings
B．strokes
C．strikes
D．stresses
单项选择题
Scientists have been eager to ______ for research funds without thinking over the impact of the research.
A．scramble
B．tumble
C．bubble
D．couple
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