单项选择题

He sat ______ his head, trying to think of the answer.

A．scrapping
B．screwing
C．scraping
D．scratching
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单项选择题
The ______ of rain forests may hamper a developing country in its fight against poverty.
A．reservation
B．preservation
C．conservation
D．compensation
单项选择题
The publishing company offers their staff opportunities for ______ in decision-making.
A．apprehension
B．appreciation
C．presentation
D．participation
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